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Excess heat is the most probable cause. Excess heat is usually caused by dirt. Usually the CPU cooling fan has become dirty or not running at all. Dirt prevents the proper airflow
http://www.answerbag.com/q_view/38429
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Chances are if your computer restarted on its own, it crashed. This
http://www.chacha.com/question/why-would-a-compute...
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check the windows updater setting especially the time for installing updates automatically..
http://answers.yahoo.com/question/index?qid=201207...
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Random restarts can be caused by many things including viruses which can in turn over work your cpu and get hot when they run in the background, especially if your fans are playing
http://answers.yahoo.com/question/index?qid=201007...
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