Solve : Computer failing login, then rebooting itself automatically???

1.	Solve : Computer failing login, then rebooting itself automatically??? Win Vista?
Answer» Help Please? Computer worked fine one day. Then the next day during startup, at the first login screen where I choose which ACCOUNT (which I only have one), it failed saying "The Group Policy Client server failed the login." Then the computer automatically shuts down and restarts itself. If I boot up to this screen but do not click my account button, it will eventually SHUTDOWN and reboot itself ANYWAYS. I tried going into SAFE Mode, same thing. Using Windows Vista. Any IDEA's anyone???

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