I recently downloaded windows 8.1. I am almost 100% that this has caused some of my games to look like I'm playing some sort of rainbow game. Not all my games do this when I play them, yet i need this to be fixed. I am windows 64 bit. I have NAVIDIA drivers. People are telling me its my graphics card, but i don't know where to look for an update. Could 32 and 64 bits make this happen? How do I fix this?