For Linux as in I boot into Linux and scan my Windows partition for viruses to make deleting the viruses really unfair for the virus. --- "The easiest way to stop piracy is ... by giving those people a service that's better than what they're receiving from the pirates." ~ Gabe Newell.
I have avast for both Windows and Linux so I can scan my drives from either OS. When fixing computers for others I use a flash drive with Kaspersky Rescue Disk 10 on it. So far it's always worked for removing the virus/malware that people have gotten.