Restore your computer to a previous functional time.
system restore, if that fails, boot off your windows installation disk, repair your bullshit, if that doesnt work, boot off your windows installation disk and format your HDD + reinstall windows kthx.
Then use recovery disc nigga.
Boot your computer in safe mode. Scan all files that were created/modified on the day you got the virus via Search. Remove any suspicious looking files.
If that doesn't work, download Combo Fix and run it.