Chuck,
A crash can only be caused by a hardware failure or a driver that isn't
"playing well with others".
I would first suggest that you boot into Safe Mode and defrag from there.
If it works, then you know that it is a driver issue.
- Greg/Raxco Software
Microsoft MVP - Windows File System
Disclaimer: I work for Raxco Software, the maker of PerfectDisk - a
commercial defrag utility, as a systems engineer in the support department.
Want to email me? Delete ntloader.