My computer keeps crashing.

[FilterDreaming]

So I edit video's (using sony vegas 9) and I was editing this one video. I decided that I would make it in HD and so I began to render. I got to 22% and then my computer turned off. I have tried changing formats. I noticed the format isn't the issue. I can render none HD clips but when I try to render HD it turns my computer off without warning. My CPU is running high at the time (between 88 and 99)

This is where it doesn't make sense.
Processor; It's an Intel(R) Core(TM )2 Quad CPU Q6600 2.40GHz 2.39 GHz
Ram; 8GB
System; Windows 7 Ultimate
System Type; 64-bit

[Dioz]

It's overheating. To render HD takes longer, so it is most likely that it is getting too hot. Is it a laptop or desktop? If a desktop, open the side panel and check it's not caked in dust. If a laptop, blow into the fan intake and look for dust.

[FilterDreaming]

Its a Desktop. I have opened it and have a fan blowing on it. I don't know if its helping yet. I am trying a lower quality HD first.

[XsrdX22]

I used to have a computer that would be over 100 degrees most of the time. Had 2 fans blowing on it, and in the winter, I'd leave a window open so cool air would blow on it.
First off, clean the dust out of everything.
Then, try applying thermal compound to the fan that cools the CPU.
Close down all other extra programs (Internet browser, games, music) before editing.
If your computer is overclocked, undo it for now.
If all else fails, might be time to purchase a new heat sink or fan.

[FilterDreaming]

The computers parts are all knew though. I had a fan on it last night and it didn't shut down.

[madbeatzj11]

And this is why macs are better for video editing.

[penguinsss]

Thank you for your fabulous input madbeatzj11.

The best I can think of OP is that the cpu isn't being cooled enough and is over heating when you're trying to encode HD video. Other than what's already been suggested I don't think there's much else you can do other than buy a newer processor.

[XsrdX22]

Even new parts can fail pretty quick. I had to get my laptop replaced a few times because of failing parts. And back when I had a desktop, I ordered a graphics card, and it died a day after I got it.
If it worked when you had a fan on it, you should invest in a heat sink or a higher quality fan.

[FilterDreaming]

This issue seems to still be present. We're installing a program that will show if its a cpu over heating issue.