Some viruses and spywares arent visible to anti-virus programs or anti-spyware while your PC is in regualar mode, reason being the actual virus is being routed threw a source file to make it look ligit to the anti-virus, its just away the creators try to hide the little buggers. Your cure, start your PC in safe mode this can be done by hitting F5 during start-up and run each anti-virus and anti-spyware one by one. quarentine and then clean .....run them twice to make sure. Clean your cookies and go to Start->Run and type
%temp% then hit ok. It should open up a folder with a bunch of file, next hold down CTRL and A both keys at the same time on your keyboard......that will highlight all the content of your temp folder, next press delete on your keyboard....that will delete everything. When you are done restart your pc in normal mode and do a scan agian. If it still shows up get back to me. Hope that helps