Not all antivirus software is the same. Occasionally, viruses go undetected risking damage to your systems or loss of information. Sophos’s free virus removal tool can be used in concert with your existing AV and it has been known to detect what others have missed. It has been updated and reissued, thanks to feedback from Naked Security readers. It now is 20% faster and has better detection and clean-up capabilities. No reason to not give it a try.