if your windows is legal, you can go to this servicestation for free
Get full service for your PC - Windows Live Safety Center is a new, free service designed to help ensure the health of your PC.
Check for and remove viruses
Learn about threats
Improve your PC's performance
Get rid of junk on your hard disk
You have to have licensed software and they require to receive this information from your pc. But that is the price to pay to have it free.
If a garagist would do this with my car for free, I would be happy. Or no, some other big firms charging as hell for services like this