The display icons for the virus may disappear, but the virus will still be running, hidden in the background on your computer, and continuing to wreak havoc on your system. In order to remove a virus without software, you will most likely need to search online and download a long list of instructions.
Updated: June 4, 2019 Home » Computer and Internet Security » Free Portable USB Antivirus
Is something not quite right with your computer even when you have an antivirus installed? Are you being plagued by pop-up windows trying to get you to download security software or alerts claiming your PC isn’t secure? It appears like your antivirus could have been compromised, therefore a portable antivirus that works alongside your existing antivirus can provide a second opinion.
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If your Microsoft Windows is infected by malware, chances are, your antivirus has been disabled by the virus or trojan. Uninstalling and reinstalling any antivirus is useless because the malware is programmed to disable it. This is where portable USB antivirus comes to the rescue. Two heads is better than one, having a second opinion from a different security software is better than none. Without further ado, here are the complete list of the best portable anti-virus scanner that can be used without installation to scan and clean infected computers
Pro & Con of Portable Antivirus
Portable standalone antivirus needs to be updated regularly; some antivirus allows you to download the database, while other requires you to download the entire software. Some standalone antivirus are not updated frequently, thus it might not be able to detect the latest malware. Here are the complete list of all portable antivirus, they are compatible with fully featured antivirus.
↓ 01 – Microsoft Safety Scanner
Do you think your PC has a virus? The Microsoft Safety Scanner is a free downloadable security tool that provides on-demand scanning and helps remove viruses, spyware, and other malicious software. It works with your existing antivirus software. Microsoft Safety Scanner expires 10 days after downloading. To re-run a scan with the latest anti-malware definitions, please download and run Microsoft Safety Scanner again.
This tool does not replace your antimalware product. For real-time protection with automatic updates, use Windows Defender Antivirus on Windows 10 and Windows 8 or Microsoft Security Essentials on Windows 7. These antimalware products also provide powerful malware removal capabilities.
↓ 02 – Avira PC Cleaner
Avira PC Cleaner is a malware scanner that works alongside other anti-malware products. It protects PCs, laptops and netbooks running Windows XP (SP3) and above. Best of all, PC Cleaner doesn’t require installation, registration or any additional drivers. On-demand scanners are often called second-opinion scanners, as they may be run next to any installed antivirus solution.
The main idea is to verify that resident security software is working correctly and that no malicious software slipped by it. While running on-demand scanners is no guarantee that the system is indeed clean, it increases the likelihood that it is.
↓ 03 – Intel McAfee GetSusp
McAfee GetSusp is intended for users who suspect undetected malware on their computer. GetSusp eliminates the need for deep technical knowledge of computer systems to isolate undetected malware. It does this by using a combination of heuristics and querying the McAfee Global Threat Intelligence (GTI) File Reputation database to gather suspicious files.
↓ 04 – Intel McAfee Stinger
McAfee Stinger is a standalone utility used to detect and remove specific viruses. It is not a substitute for full anti-virus protection, but a specialized tool to assist administrators and users when dealing with infected system. Details on new or enhanced signatures added with each Stinger build are listed in the Readme details.
Stinger now includes Real Protect – a real-time behavior detection technology that monitors suspicious activity on an endpoint. Real Protect leverages machine learning and automated behavioral based classification in the cloud to detect zero-day malware in real-time.
↓ 05 – Intel McAfee Security Scan Plus
McAfee Security Scan Plus is a free diagnostic tool that ensures you are protected by actively checking your computer for up-to-date anti-virus, firewall, and web security software. Security Scan Plus scans for threats such as malware, Trojans, and unwanted programs actively running on your computer. It even scans your browser history for suspicious activity.
When a scan is complete, a report provides details on the presence and status of your security protection. If problems are detected, Security Scan Plus provides security recommendations. Security Scan Plus automatically scans your computer on a weekly basis to ensure your antivirus software, firewall protection, and web security are active and up to date.
↓ 06 – Intel McAfee RootkitRemover
McAfee RootkitRemover is a stand-alone utility used to detect and remove complex rootkits and associated malware. Currently it can detect and remove ZeroAccess, Necurs and TDSS family of rootkits. McAfee Labs plans to add coverage for more rootkit families in future versions of the tool.
↓ 07 – Comodo Cleaning Essentials
Comodo Cleaning Essentials (CCE) is a set of computer security tools designed to help users identify and remove malware and unsafe processes from infected computers. Designed as a portable application, the software requires no installation and can be run directly from removable media such as a USB key. CCE consists of two core technologies:
Fully featured malware scanner capable of unearthing and removing viruses, rootkits, hidden files and malicious registry keys hidden deep within a system. The scanner is highly configurable, uses the latest heuristic techniques to detect previously unknown viruses, features first-class malware removal capabilities and is capable of detecting hidden drivers and services loaded during system start-up.
- Instantly identify and stop every untrusted process running on an endpoint with a single click
- Powerful antivirus scanner capable of removing malware, rootkits, hidden files and malicious registry keys hidden deep within a system
- Forensic level stats and graphs allow internal processes and resource usage to be analyzed with unrivaled granularity
- Integration with Comodo cloud scanners provides real-time safety verdicts for unknown processes
- Perfect for ensuring network endpoints are totally clean of threats
- No installation required – can run direct from USB or user desktop via RDP
↓ 08 – Kaspersky Virus Removal Tool
They’ve changed the way this software runs now, it is not portable anymore but still perform the scan as usual. Checks for known malware and software vulnerabilities on your PC – plus advises you on your PC’s security status with the free Kaspersky Virus Removal Tool. Kaspersky Virus Removal Tool uses Kaspersky Lab’s latest technologies – plus real-time access to cloud-based security information – to ensure it can scan your PC for the latest viruses and emerging threats.
A very simple quick scan for viruses and malware, during the download of Kaspersky Virus Removal Tool, there will be a download of Kaspersky Security Scan installation files, as well as Kaspersky Software Updater which is an integral part of Kaspersky Virus Removal Tool. Get FREE & quick help for your PC – download an efficient tool to clean up your computer from viruses, Trojans, malware, adware and more.
↓ 09 – Kaspersky TDSSKiller
A rootkit for Windows systems is a program that penetrates into the system and intercepts the system functions ( Windows API ). It can effectively hide its presence by intercepting and modifying low-level API functions. Moreover it can hide the presence of particular processes, folders, files and registry keys. Some rootkits install its own drivers and services in the system (they also remain “invisible”). Remember, TDSSKiller is not a substitute for anti-virus or Internet security software protection. To keep your computer and devices secure, you should install Internet security software.
↓ 10 – Symantec Norton Power Eraser
Eliminates deeply embedded and difficult to remove crimeware that traditional virus scanning doesn’t always detect. Norton Power Eraser is a free tool that can be downloaded and run to remove threats from your computer. You can run this tool to scan for threats even if you have a Symantec product, or any other security product. If you cannot start the computer in Normal mode, you can run this tool in Safe mode. Norton Power Eraser is easy to download, and scans your computer quickly to detect the most aggressive computer viruses. You don’t need to install this tool.
The Norton Power Eraser tool is compatible with computers running Microsoft Windows operating systems only. It does not work with computers running on Mac OS X. Norton Power Eraser uses aggressive methods to detect threats, and there is a risk that it can select some legitimate programs for removal. You should carefully review the scan results page before removing files.
↓ 11 – Symantec Norton Security Scan
The power and speed of Norton scan technology, available to you for FREE. Scans your computer and lets you know if viruses or malwares are present.
Use Norton Security Scan to determine if your system has been infected with viruses, malware, spyware, or other threats. Newly added — the Cookie Manager that you can use to check for suspicious or dangerous cookies and remove those that raise a concern.
↓ 12 – Dr.Web CureIt!
Run Dr.Web CureIt!® (no need to install it) is Russian antivirus that quickly scan your computer and cure it of any malicious objects. Dr.Web CureIt! is an indispensable tool for curing computers running MS Windows 8/7/Vista/XP/Server 2003/2008/2012 (32- and 64-bit systems). Dr.Web CureIt! detects and neutralizes viruses, rootkits, Trojan horses, spyware, and other malicious objects that have gone undetected by your anti-virus software.
The Dr.Web CureIt! utility will cure an infected system once, but it is not designed to provide your PC with real-time protection from viruses. The utility available on our website always features the latest virus definitions, but its virus databases aren’t updated automatically. Included in Dr.Web CureIt! is a set of virus databases that are only current until a new update is released (usually one or more times per hour).
↓ 13 – Zemana AntiMalware Portable 14 Days Free Trial
Clean your computer in minutes, no matter how badly infected! Zemana AntiMalware Free makes it possible! Zamana AntiMalware is an excellent choice to have installed on your computer, because of the low resource consumption you can use the program daily to make sure your not infected with any malicious files, and because of the ease to use interface the program is avaiable to every computer user and not only expert.
- Advanced Malware Detection and Removal
- Browser Cleanup
- Effective Against Rootkits and Bootkits
↓ 14 – Emsisoft Emergency Kit
The Emsisoft Emergency Kit contains a collection of programs that can be used without software installation to scan for malware and clean infected computers: Emsisoft Emergency Kit Scanner and Emsisoft Commandline Scanner. The Emsisoft Emergency Kit Scanner includes the powerful Emsisoft Scanner complete with graphical user interface. Scan the infected PC for Viruses, Trojans, Spyware, Adware, Worms, Dialers, Keyloggers and other malicious programs.
↓ 15 – Sophos’s HitmanPro 30 Days Free Trial
HitmanPro is only 12 MB and requires no installation. It can start directly from a desktop, USB Flash Drive, CD/DVD, or a remote storage device. Even if your antivirus is being manipulated by malware or ransomware is getting a hold of your files, HitmanPro functions normally, detecting and removing the threat.
HitmanPro has the ability to remove persistent threats from within your operating system and replaces infected Windows resources with safe, original versions, all while proactively blocking reinfection attempts. A new host of malware is activated every day and can be found everywhere, even on trusted websites, evading regular antivirus programs. HitmanPro is designed to run alongside your antivirus, using its behavioral deep scanning to find and eliminate zero-day, next-gen malware that has avoided detection.
↓ 16 – ESET Free Online Scanner
Detect and remove malware on your PC with a powerful and user-friendly tool that uses the same ThreatSense® scanning technology and signatures as ESET Smart Security and ESET NOD32 Antivirus — just by using your web browser. One-time scan to remove malware and threats from your computer for FREE.
- Smart way to test your antivirus – Easy-to-use tool that can run alongside any existing antivirus
- Comprehensive malware detection – Find and remove viruses, Trojans, spyware, phishing and other internet threats
- FREE and easy-to-use tool – No commitment, no registration and completely free one-time scan
- Periodic scanning of your device – Regular and automatic monthly check for infections and suspicious applications
↓ 17 – TrendMicro HouseCall
HouseCall is Trend Micro’s highly popular on-demand antivirus software scanner for identifying and removing viruses, trojans, worms, unwanted browser plugins, and other malicious software. HouseCall Antivirus includes the following features:
- Stand-alone eliminates compatibility issues associated with browser-activated scanners
- Smart Scan delivers the latest antivirus protection while reducing download times
- Enhanced Detection and Cleanup addresses rootkits and other sophisticated threats
- Enhanced Scanning performance speeds threat detection
- Vulnerability scans find threats on other devices connected to your home network
↓ 18 – F-Secure Online Scanner
Free Virus Scan And Removal
F‑Secure Online Scanner helps to get rid of viruses and spyware that may cause problems on your PC, and it works even if you have another security software installed on your computer. F‑Secure Online Scanner is easy to use with just a couple of clicks: just download it and run it. It does not leave anything on your PC. Virus worries? Run a scan for free and get rid of malware.
- Find and remove viruses, malware and spyware on your PC
- Easy to use, doesn’t leave anything on your computer
- Works with any other security software installed
- Completely free to run and use
↓ 19 – Panda Cloud Cleaner
Panda Cloud Cleaner is an advanced disinfector based on Collective Intelligence (scanning in-the-cloud) that detects malware that traditional security solutions cannot detect. Disinfect your computer with Panda Cloud Cleaner, they help you keep viruses at bay. Greater detection capacity than traditional antivirus solutions thanks to its latest generation technologies.
Online detection of all types of malware, vulnerabilities and unknown threats. It is easy to use from your browser and always up-to-date against the latest threats. A free report about threats detected and the status of the security protection installed on your computer.
↓ 20 – ClamWin Portable
ClamWin is a Free Antivirus for Microsoft Windows. It provides a graphical user interface to the Clam AntiVirus engine. It features high detection rates for viruses and spyware, regular antivirus updates from the ClamAV team, and a standalone antivirus scanner. ClamWin allows for manually scanning individual files, folder, or drives but does not include an always-on background scanner.
↓ 21 – Sophos Virus Removal Tool
Using cutting edge technology found in our enterprise-grade software, this powerful tool detects all types of malicious software on your computer—including viruses, spyware, rootkits and Conficker—and returns it to a working state.
The tool has direct access to virus data from SophosLabs, our global network of threat researchers, ensuring that even the very latest viruses are detected and removed. And it works alongside your existing antivirus. Their free Virus Removal Tool is a quick and easy way to find and get rid of any threats lurking on your computer. Our tool identifies and cleans up infections your antivirus might have missed.
- Removes viruses, Conficker, rootkits, and fake antivirus
- Supports Windows XP SP2 and up
- Works alongside your existing antivirus
↓ 22 – VIPRE Rescue
VIPRE Rescue is a handy, easy to use tool designed to clean your computer if you are already infected with a virus and your operating system is not working properly as a result of the infection. If you are already running VIPRE and a virus has disabled it, you can still run this program to clean your computer..
↓ 23 – eScan Anti-Virus Toolkit
eScanAV Anti-Virus Toolkit (MWAV) is a FREE utility that enables you to scan and clean Viruses, Spyware, Adware and any other Malware that may have infected your computer. The eScanAV Anti-Virus Toolkit (MWAV) requires no installation and can be run directly from anywhere, on your computer, USB Drive or from a CD ROM. It can also run if you already have other Anti-Virus software installed on your computer.
The eScanAV Anti-Virus Toolkit (MWAV) also gets updated on a daily basis with the latest updates to detect spyware and adware released recently, plus the engine is constantly being improvised for faster and intelligent detections. Free eScan Antivirus Toolkit Download for Windows® 2012 R2 / 2012 / 2008 R2 / 2008 / 2003 R2 / 2003 / 10 / 8.1 / 8 / 7 / Vista / XP. Scan for Viruses, Spyware and Adware in your computer. Just download and run. No installation of this software required.
↓ 24 – Avast aswMBR
aswMBR is the rootkit scanner that scans for MBR/VBR/SRV rootkits. It can detect TDL4/3(Alureon), ZAccess, MBRoot (Sinowal), Whistler, SST, Cidox, Pihar and other malware. The current version of aswMBR uses “Virtualization Technology” to improve detection of stealth malware. Please note that to use this feature your machine & CPU must support hardware virtualization.
↓ 25 – BitDefender Quick Scan [ Discontinued ]
Bitdefender QuickScan uses in-the-cloud scanning technology to detect active malware on your system, in under a minute. Because it focuses on active e-threats, the product uses just a fraction of the system resources needed by a regular virus scan and requires no time-consuming virus signature updates, as the detection process is performed by remote Bitdefender servers.
How To Stop Viruses, Trojan and Malware
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A phishing scam has targeted Mac users by redirecting them from legitimate websites to fake websites which tell them that their computer is infected with a virus. The user is then offered Mac Defender 'anti-virus' software to solve the issue.
This “anti-virus” software is malware (i.e. malicious software). Its ultimate goal is to get the user's credit card information which may be used for fraudulent purposes.
The most common names for this malware are MacDefender, MacProtector and MacSecurity.
Apple released a free software update (Security Update 2011-003) that will automatically find and remove Mac Defender malware and its known variants.
The Resolution section below also provides step-by-step instructions on how to avoid or manually remove this malware.
How to avoid installing this malware
If any notifications about viruses or security software appear, quit Safari or any other browser that you are using. If a normal attempt at quitting the browser doesn’t work, then Force Quit the browser.
In some cases, your browser may automatically download and launch the installer for this malicious software. If this happens, cancel the installation process; do not enter your administrator password. Delete the installer immediately using the steps below.
- Go into the Downloads folder, or your preferred download location.
- Drag the installer to the Trash.
- Empty the Trash.
How to remove this malware
If the malware has been installed, we recommend the following actions:
- Do not provide your credit card information under any circumstances.
- Use the Removal Steps below.
- Move or close the Scan Window.
- Go to the Utilities folder in the Applications folder and launch Activity Monitor.
- Choose All Processes from the pop up menu in the upper right corner of the window.
- Under the Process Name column, look for the name of the app and click to select it; common app names include: MacDefender, MacSecurity or MacProtector.
- Click the Quit Process button in the upper left corner of the window and select Quit.
- Quit Activity Monitor application.
- Open the Applications folder.
- Locate the app ex. MacDefender, MacSecurity, MacProtector or other name.
- Drag to Trash, and empty Trash.
Malware also installs a login item in your account in System Preferences. Removal of the login item is not necessary, but you can remove it by following the steps below.
- Open System Preferences, select Accounts, then Login Items
- Select the name of the app you removed in the steps above ex. MacDefender, MacSecurity, MacProtector
- Click the minus button
Use the steps in the “How to avoid installing this malware” section above to remove the installer from the download location.
Note: Apple provides security updates for the Mac exclusively through Software Update and the Apple Support Downloads site. User should exercise caution any time they are asked to enter sensitive personal information online.