It just happened yesterday for the first time. According to one of my friends there is hot fix for this. Does anyone knows anything about this. The event is as follow:

Level Date and Time Source Event ID/Task Category

Critical 4/20/2010 2:41 PM Kernel-Power 41 (63)

System Error.txt

There's no hotfix for this, because this usually comes down to a processor/motherboard combination problem, a mismatched CPU issue (in multiple CPU systems), or a driver issue (in fact, audio drivers are the usual culprit in driver failures). However, without access to a complete memory dump of a system generated when this occurs, you're only going to get guesses, unfortunately. This has 3 possible causes (look for Event ID 37 in your logs as well - that is a clue it's a CPU issue), but the bugcheck won't give you any clues as to which (it's params are always all 0s). A memory dump analysis is the only way to be sure, short of seeing Event ID 37 also in the logs on that system.

I shouldn't said that it shut down. It restarted no blue screen. weird.

Might want to uncheck Automatically Restart in the Startup and Recovery settings of the advanced computer properties to make certain it didn't bluescreen.