a different computer question...maybe someone knows

Could be lots of things, but most likely it's a software bug in a device driver or one of the applications that is running. You were probably on the right track making sure all the drivers are the latest available. What graphics card do you have? That is the next thing I would check since the lockup occurs when it's updating the screen.

When you reboot after a lockup, do you get a Microsoft Serious Error alert? If so, save the memory dump and send the report to Microsoft.