If you still happen to have problems (i.e. flickering graphics or glitching), open up your Task Manager, click on the Processes tab, and look for the program "LVComS.exe". End that program and window back into your game. This has worked for me in the past and maybe some other person out there is having the same problem. As my research has found, "LVComS" is a Norton associated task. Experience with the program shows that Norton works just fine without it. If anyone happens to know what exactly this .exe does, feel free to respond.