log in loop

Log-In Loop

I installed the Beta yesterday as an upgrade over XP-Pro sp2 and the installation went fine, although very slow.
When I get the log-in screen, I type my password and press enter. So far so good.
Then it says:
1) Logging In 2) Preparing Desktop 3) Closing Desktop 4) Logging Out
And back to the log-in screen.
I
have tried booting in Safe Mode and every other option available and I get the same thing.
Help!

Windows Vista

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