There are some virus scanners for Linux and I think that one may be included with Knoppix. But again there are some issues: Knoppix 4.0.2 is almost a year old now and 5.0 is not officially out on the Internet, so any virus definitions that are included on the disc would be out of date (they would likely be out of date on the 5.0 disc by the time that you get it also). And depending on what version of Windows you have it might not be able to do anything more than tell you that you have a virus; Knoppix can not safely write to NTFS partitions (there are rumors of technology in 5.0 but I'll wait for the official release before considering this more). There are good free scanners available that run under Windows, I suggest using these if you can get Windows to boot at all. If not then I suggest a complete reinstall. Mamy times there are things that one proream like spybot don't find, try several.