Ok, after a power supply failure I had recently, something stupid has been happening. In CS:S, certain maps (De_dust, cs_italy, de_inferno, etc.) have been, as soon as they load, my computer changes resolutions to a very low one, and shows the error saying that nv4_disp has stopped responding. I then went and played NFS: MW for a little while, and as soon as I start a specific race near the start of the game, that happens. It did this on the old hard drive, and I just formatted a new one and put XP on it, and it does the same darn thing. Any ideas? I have tried updating GPU drivers, and installing DX9.0c.