All of a sudden I am getting an error message regarding this physxcudart_20.dll Most of my new games no longer work (such as MOH and BC2) When I attempt to open the games I immediately get a general protection fault message. I reinstalled win 7 which did not help. I reinstalled the games which did not help. I actually found this file on my main drive so I do not understand why it sais I do not have it. I ran a virus scan in safe mode which found nothing. The only odd change I have noticed about this PC is that now when I right click I have a "BITZIP" option which was never there before. Is this something my teenager may have downloaded while loading music? Would it cause these problems?