Check with your motherboard manufacturer for the latest BIOS update and chipset drivers. I had a lot of problems with 3D games with an ATI card on an Asus P5A motherboard. Both Asus and ATI admitted to some incompatibilities and claimed to be working on updates and patches, but I just gave up and went to a 3Dfx card and have not had any trouble since.

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Steve Taylor - Service Manager
Altoplanos Information Systems, Inc.
Coeur d'Alene, Idaho USA
www.altoplanos.net