Find someone with the same OS you're running and an anti-virus program.
Make boot disks (NOT rescue disks) from their computer.
Boot with those disks and scan like that.
This takes your hard drive out of the picture and you are not using an infected drive to scan. It also goes one step beyond the booting in safe mode. Safe mode is the best idea if you cannot boot with boot/scan disks from another, clean, computer.
Sent from my rotary phone
"The way I see it as soon as a baby is born, he should be issued a banjo!"- Linus Van Pelt
UNIX - Not just for Vestal Virgins any more