Windows 7 Windows games crashing

kemical: OptiPlex 745 uses a different bios than the OptiPlex GX620. Both systems are running the most current versions available from Dell as follows:

OptiPlex 745 Bios 2.6.3 (11/30/2009)
OptiPlex GX620 Bios A11 (12/5/2006)

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