Though this problem seems to have solved itself, may I at least make a suggestion to you on the possibility of virii?
McAfee is CRAP for detecting virii. Invest in Norton AV. Then also d/l things like Spybot S&D and other Spyware/Adaware destroyers.
Run these programs on a regular basis.
Also defrag & scandisc regularly.
Because reading through this thread, I still feel it could have also been caused by a virus (up until the end where you say it's now corrected itself).
But shutdowns and reboots like you were having are common with virii.
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