Unfortunately I already encountered the instability again while I had the updates uninstalled. I did find three drivers that were out of date. I had success in updating the Realtek and Nvidia drivers, but I have not found an update for the following: Intel 82801 PCI Bridge 244E, ver. 5.2.3790.3959, dated 01/10/2002. The Intel auto install utility keeps saying that it has totally updated the chip set drivers but "Driver Detective" keeps saying that this one is out of date.
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GA-P35-DS3L Rev. 2.0 - Intel E8400 Wolfdale @ 3.0 GHz - Thermalright Ultra 120 Extreme - 4x2 GB Mushkin XP PC2-8000 - Gigabyte 8800GTSx512 MB
Arctic Cooling Accelero S1. Rev2. - 2x500 GB Seagate Barracuda 7200.11 - Pioneer DVR-212D - Antec P182 - Corsair TX650 - 22" Hanns-G - XP Pro 64 SP2