Last week I've got a new PC for evaluation of W2K8 Server - especially Hyper V features. Unfortunately, two days ago the box started to show me BSOD approximately once a hour. All the available out-of-box checks didn't show valuable results. Microsoft error reporting displayed on each new start after crash, the report is corrupt. Analyzing of numerous dump files didn't show any regularity either.
Only usage of Microsoft Memory Diagnostics helped to detect memory problems:
This free tool was the only solid technical witness for computer store to change the bad memory modules.
I would highly recommend to burn this bootable diagnostics CD and keep it in the "emergency box" to be able to detect memory problems quickly.