Hi, found this: I agree with DaChew, disable fast user switching.
This is a relatively rare error condition. Most documentation points to a driver problem — so check all hardware drivers starting with the most obvious, the video driver. Microsoft’s main page recommends general hardware troubleshooting, so use the General Troubleshooting of STOP Messages checklist below."
General Troubleshooting of STOP Messages
If you can’t find a specific reference to your problem, running through the following checklist stands a good chance of resolving the problem for you. This checklist is also usually the best approach to troubleshooting some specific Stop messages, such as 0x0A and 0x50.
Examine the System and Application logs in Event Viewer for other recent errors that might give further clues. To do this, launch EventVwr.msc from a Run box; or open Administrative Tools in the Control Panel then launch Event Viewer.
If youve recently added new hardware, remove it and retest.
Run hardware diagnostics supplied by the manufacturer.
Make sure device drivers and system BIOS are up-to-date.
However, if you’ve installed new drivers just before the problem appeared, try rolling them back to the older ones.
Open the box and make sure all hardware is correctly installed, well seated, and solidly connected.
Confirm that all of your hardware is on the Hardware Compatibility List. If some of it isnt, then pay particular attention to the non-HCL hardware in your troubleshooting.
Check for viruses.
Investigate recently added software.
Examine (and try disabling) BIOS memory options such as caching or shadowing. http://support.microsoft.com/?kbid=890648&sd=RMVPhttp://msdn2.microsoft.com/en-us/library/ms724836.aspx
Edited by Monty007, 16 April 2008 - 04:43 PM.