logon process initialization failure

This morning my one week old test build of Microsoft Windows Vista
Business Edition rebooted without warning and performed a check disk
on reboot. Running on a Dell Lattitude D630.
I am now stuck with an error that I am unable to circumvent in normal
or safe mode boot. I cannot run Windows, and cannot find any mention
of the error text below on the Microsoft website, nor any helpful
posts anywhere on the net other than "me too" and "re-install it!"

Error after reboot:

Logon process initialization failure
Interactive logon process initialization has failed
Please consult the event log for more details (I would love to but uh
can't)

Any ideas other than re-install?
Any ideas why I should continue testing Vista???