XP Antivirus needs a bit more grunt to shift than those two offer.
Download and save this to your Desktop
http://downloads.andymanchesta.com/RemovalTool s/SDFix.exe
Double click SDFix.exe and it will extract the files to %systemdrive%
(Drive that contains the Windows Directory, typically C:\SDFix)
Now boot into Safe Mode and run it from there. When it is finished it will prompt you to reboot the computer. press any key to do so.
It will restart your computer and complete the cleaning process.