Vista logging off then Shutting down by itself (even in Safe mode)

Hey guys,

Bought a new Dell PC last year with Vista premium already installed on it. I had some issues when I tried to update (service pack one cause the admin users access to freeze upon logging in crtl-alt-del wouldnt even work).

Created a new users or a guest and vista seemed to work fine (though logging in as the old admin user still cause the system to freeze).

1 month or so later and the system will allow me to log on (new user/guest) and within 60 seconds the system loggs off and shuts down all on its own).

Restarting in Safe mode cause this to shut down to happen even faster

As the system starts up fine and allowed me to log on view the files on my desk top, I took this as a sign my hard drive/power source was working. (Right?)

A tech that looked at the machine Briefly mentioned that it might be because Microsoft is under the impression that this is a pirated copy for some reason (why the issue also happens is safe mode)

Anyone have any similar issue?

Windows restarts as a result of Windows crashing- Constant rebooting is most likely a result of Windows Corruption. Use your Disk/recovery partition to access advanced recovery ultilities. Perform a system restore to a point before the crashes, or reinstall/repair your Windows Installation.

Further info regarding endless reboots and Pirated software:

SP1 can also cause endless rebooting. (Download all updates from Windows Update including any prerequisite updates before SP1 installation)
The problematic update — Servicing Stack Update (KB937287) — was pulled from the automatic update in February.
However, now Microsoft has the problem in hand, according to the Microsoft Update team blog: "We discovered that there were a few unknown and rare events during the middle of the installation of the update that could cause the update to think it needed a reboot to complete the installation. If this happened, the system entered a repeating reboot loop."
A fix is being released on Tuesday which will install prior to the problematic update and prevent the system from rebooting during installation. Changes have also been made to the Servicing Stack Update installer code so it checks for the fix before installing. Both updates will install in the proper order through Windows Update.
-April 2008 ZDNET

Pirated software warning-
Users whose systems are identified as counterfeit will be presented with clear and recurring notices about the status of their system and how to get genuine. "They won't lose access to functionality or features, but it will be very clear to them that their copy of Window Vista is not genuine and they need to take action"

Kinda reminds me of the Blaster worm.