After what seems to be a successful upgrade from XP Pro to Vista Beta 2 when logging on the screen shows building desktop then immediately closes desktop and shuts down no matter which user acct. is used. Please help!!!!

Vista Beta 2 Won't Logon
After what seems to be a successful upgrade from XP Pro to Vista Beta 2 when logging on the screen shows building desktop then immediately closes desktop and shuts down no matter which user acct. is used. Please help!!!!
Windows Vista
User login
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