My best advice would be to get your hands on some type of bootable virus scanner. I don't know of any good free ones, but most retail antivirus software will have a cd that you can put in your computer, reboot, and it scans your computer before your operating system loads.
Make sure you have your cd drive set to boot at startup. This can be done through BIOS. If you have any questions feel free to ask.
Alternatively, you might consider using a different antivirus software. AVG is free and works well for me. I can't say I've ever heard of Kapersky or whatever your using. get it here: http://free.grisoft.com/