Bro.. ask lang ku.. sa youtube ra xa mu freeze or mu. crash? how about when playing media like movies through WMP? reformatting PC may fix the issue pero sa uban, its not an acceptable solution since hasulan ug back up, reinstall programs, and all that stuff.. If you don't mind backing up or you don't really have a lot of things in your PC then fresh install could be the best way to know if Vcard is defective.. But from what it sounds like, "only in Youtube", i doubt its your card.