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Could be a memory problem or simple overheating.
How are you reading the temperatures? BIOS or temp monitor software? If the latter, what's the cpu's idle temp vs its temp before crashing? 66c is hot for anything but a mobile processor. Very hot if it's just idling.
You're sure the procesor fan is operating? No squealing? Try not to touch it. The oils attract dust & accelerate failure.
A simple caveman test is to direct a small room-fan into the open case & try again. If it works longer you know the problem is temperature related.
Did you remove the heatsink/fan when you cleaned? If you did you should clean the remnants off & reapply thermal compound. If you added more it could be too thick to conduct properly.
Also, careful about using an ungrounded vacuum. Don't touch anything with it, especially if powered. Very easy to cause ESD damage which ends up causing time-consuming intermittent failures. Boo.
Questions, questions. Just pointing out things I'd be watching.
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