Some but not all of my programs keep crashing after about 20sec . Im trying to install tonyhawk4 and it crashes after 20sec of installation. Ive noticed that when im playing a different game(MVP2003) the game gets choppy about every 20sec. Ive done a free virus scan and found no viruses.Im thinking maybe something is in the background doing something annoying.My norton antivirus crashes after 20sec of scanning. So that is why i relied on the freewebscan. Any suggestions would be great.