Why does my computer turn bad every time I run Powerpoint?

I own a Compaq Presario nouns top computer.
I can run Powerpoint but when I view a presentation or rub down a presentation the computer completely turns off.
Could this be an issue near overheating? If so, what can I do to correct this problem?

Answer:
The usual causes for unselective shutdowns are:
1)Overheating triggers auto-shutdown to protect the CPU;
2)Memory module going bad;
3)Power supply going impossible.
additional to the comments... it could conflicted beside other program when you run power point.

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