Sophos Clean

Sophos Clean is designed to discover viruses, trojans, rootkits, spyware, and other malware on up-to-date and fully-protected computers. This is next-generation technology to fight against next-generation malware. Sophos Clean is a signatureless, on-demand malware scanner that’s just 11 MB and does not need to be installed. You can run it from a USB flash drive, a cd/dvd, or from network attached storage, which is nice if malware is manipulating the installed antivirus software and its updates.