GFX corruption. You will need to either download the latest driver sets for the onboard chip, and or reinstall the game, or a combination of both. Now, if it is a memory write problem, then try reseating your memory modules, and then go into the RUN command on the start bar. Type in cmd in that. Then when it loads cmd up, type in chkdsk /r. It will ask if you want to schedule it, input yes, and then restart your PC and let it run. Hope that fixes it. Give me an update if it does or doesnt.