If you browse around for a 'solution' you will find an enormous number of creeps trying to con you into buying their junk apps to 'really' clean your machine.
Also, there are seemingly endless posts and tips about how to alter registry keys and values - Most both wrong and dangerous.
Try this... All free and all actually work...
First >
Prevx Downloads
then
>
Nod32 - Free Virus Scan: Use ESET's Online Antivirus Scanner
These apps really do clean- And protect if you go wild and actually buy them.
btw - I can assure you absolutely that you will NOT be able to download in any p2p network either of the above programs... Well, you can download
things with the same names, but... LOL