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#11
Follow the excellent and consistent advice given to you. Be sure to use Microsoft Security Essentials as your anti-virus software.
Ok thanks everyone for helping me so quickly!
I'll do a clean reinstall with a new Windows 7 disk (since the other one was upgrade-only). I'll just copy my important files to a hard-drive since I can easily install my other programs. And I'll use Microsoft Security Essentials, COMODO Firewall and Malwarebytes' Anti Malware.
I learned alot from this and I'll be more carefull with my next OS.
:)