vista shuts down

Vista shuts down

I am running Vista Beta2 5384 on a Dell Optiplex GX240, 640MB RAM, 80GB Hdd for testing
All goes well, EXCEPT it seems to shut down after 10-15 minutes of non-use. I have changed power options to NEVER NEVER for monitor and HDD.
At first I thought it was going into sleep mode, but every time it goes off, I wiggle the mouse, hit the KB, no go.. I need to press the power button and it basically starts from scratch. It even tells me that this PC was not shut down properly...how do I want to boot, safe mode...etc
Any ideas?

Windows Vista

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