#2 Sophos Anti Rootkit Portable:

Sophos Anti Rootkit Portable is one of the most used toolkits across enterprise space. Sophos Anti Rottkit is totally recommended to users who had enough with their usual antivirus suites, failing to detect malicious rootkits and viruses. Sophos can be considered simply remarkable when it comes to locating rootkits or for a portable app. Sophos is 100 percent free and supports operating systems like Windows XP, Vista and 7. The app works great alongside your existing antivirus.

#1 ClamWin Portable:

Free, powerful and trustworthy open source software- that’s ClamWin Portable. With a high detection ratio and easy to use graphical interface, ClamWin Portable is one of the most used and easily portable antivirus tools across the enterprise space. The virus definitions of the database are updated frequently. The only disadvantage of this tool is that it doesn’t offer a real-time scanning option. But still with strong malware detection rate and pretty good GUI interface, this suite is one of the best portable antivirus tools available in market.

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