Hmmm,
You seem to have a number of problems, but none that would obviously cause a shutdown on its own.
I would go into the system and disable all power saving and sleep functions whilst we are troubleshooting. Remember to turn them back on when we are done
EDIT: You beat me to that one gore
Make sure that there is no disk in your CD/DVD drive. If there is then it is probably defective; if there isn't then I would go into hardware in the control panel and uninstall the drive then reboot to let Windows rediscover it.
Go to MS update and get the SP1 update for .NET 1.1 and try a manual install.
Disconnect your printer and any non-essential USB devices. Get the latest driver for your printer, uninstall then reinstall with the latest driver.
I agree that it doesn't look like a heat issue.
You might as well run chkdsk and MemTest86 whilst you are at it? just to rule them out of the equation.
Hopefully that will remove some of the background noise so we can get a better look?
EDIT:
By the way, if this is a laptop, it may be Battery.
Good point...AFAIK the Vaio is a laptop. My Compaq warns you when it is going to do this because the battery is low, so the question would be if this happens when you are connected to the mains power supply?
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