Boot scan trouble

Hello everyone, after i finished a boot scan the computer boots vista, then i got a message that my vista isnt legimate (but it is since it was already on the PC when i buyed it)
I am going to try a system restore and see if that works, if it doesnt… please help.

Ok the system restore program worked, windows says it likes me again :wink:
Still its weird that it comes up after a virus scan… :-\