Its probable your computer has been infected by the Sasser.worm
to stop the rebooting process go into Start\Run\and type shutdown -a
and hit enter.. that is if you have enough time, and follow the instructions
on What to Do if your Computer has been Infected by the Sasser.worm
What you should know about the Sasser.worm and its variants. http://www.microsoft.com/security/incident/sasser.mspx
Find out how to tell if your computer is infected with the Sasser worm and
what steps you should take to remove it.
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