Okay let's try some standard things.
1) Rename the AVI folder to AVI_back
2) Set the color depth to 16BIT
3) Turn off everything in the background like E-mail/ICQ/Messenger, Virus protection and everything in the system tray beside the clock.
Especially #1 for your situation.
You may have trouble in game because you have VIA drivers which are known to be buggy. They should not be causing this problem though.
1) Rename the AVI folder to AVI_back
2) Set the color depth to 16BIT
3) Turn off everything in the background like E-mail/ICQ/Messenger, Virus protection and everything in the system tray beside the clock.
Especially #1 for your situation.
You may have trouble in game because you have VIA drivers which are known to be buggy. They should not be causing this problem though.