Try using another virus scanner... Did you try housecall off the net?

http://housecall.antivirus.com/

I assume you have only one file left somewhere that your AV spots but can't delete, right?
or did you downloaded Sub7 and can't delete it?

In any case, if you have the name of the file, locate it on your HD, make sure you have rights to delete it (not read only) and delete it!

Afterward, you can look for a registry cleanup tool in google and delete any reference to sub7 files in it...