First attempt to post a screenie. This is what I saw when I logged in. I did not get any error messages.
Compaq Presario 2525US
Windows XP home
512 memory with 128 shared to video
P4 2.4

Edit;
Radeon igp 345m according to device manager. driver 6.14.10.6436 dated 5/15/04. It is the latest driver windows can find and radeon has no newer drivers listed on their site.
Edit 2;
This began happening much more frequently but without the smearing effect from movement. I discovered I had -fullbright tagged to the shortcut for the darkness issue, which I had forgotten I had set. Removing the fullbright has resolved the issue.
I guess I should have said this error has only happened once. I did however have trouble logging in. Took 4 tries to get to the log in screen. --repair said everything was fine. That was the result when I got into the game.