Viruses/malware can cause system restarts in this manner. I'd first suggest that you run this free, online scan to double check your current protection: http://safety.live.com
Then I'd suggest checking your Event Viewer for errors (Start...Run...type in "eventvwr.msc" (without the quotes) and press Enter). Check at least the Application and System categories for errors around the time of the shutdowns. Let us know what you find (some errors aren't as bad as others).
You can get more info about the errors by right clicking on them and selecting "Properties".
In the event that this occurs beneath the level that Windows can recognize (evidenced by a lack of significant errors in the Event Viewer) then it's time to start troubleshooting the hardware (although there can still be software errors and/or malware causing this).
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
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