you don't remove the whole virus with windows based virus scanners, because some of the virus is running and normally won't be shutdown (the ppl who write viruses know this
) so you have to use some thing to remove the viruses before the get to execute any code, so download an av that supports boot time scanning or download a live os and use it's interface to remove the virus, i recomend using an os with a virus scanner so you don't miss any files..
i remove viruses all the time for my stupid friends using the following method
download bartpe builder (
www.nu2.nu/pebuilder/)
download the avast extention (
http://www.avast.com/eng/avast_bart_cd.html)
make an iso
boot off your burnt iso
depending on when you made your iso update the virus defs. or not
scan and remove infected files
reboot into windows
[edit: missing word]