multiple vista beta 2 crashes doing nothing

Multiple Vista Beta 2 crashes doing nothing

I just installed the windows Beta 2 today, and I can't make it run correctly. It automatically crashes after a short time. Sometimes I can't access the workspace, sometimes I manage to run an application, but can't stay more than one minute under Vista without crashing.
I tried the safe mode. it runs correctly without Networking support, but I got crashed when I tried with networking.
The crashes are not blue screens. They are a simple reboot (without asking my permission...).
Can someone help me?

Windows Vista

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