I am also running SH3 NYGM and GWX on a Toshiba Satellite with ATI Mobility Radeon 9600. I never updated my drivers since 2 years I have it and everythign runs fine. I understand this won't help you but just wanted to give the info that it might not be a GWX related issue.
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NYGM 3.4A / Living SH3 V5.1 + SH3 Commander
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