I had Vista installed via bootcamp on my Mac in early 2006 when Apple released it's first intel lineup. I experienced at that time unexpectedly crashes and blue screen when leaving my computer on during the night. After some time I could not take it anymore and installed XP instead and it worked flawlessly. With the Toshiba PC I just set up with Vista Ultimate, the same problem occurs. I guess they haven't fixed this bug and they probably never will.
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