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Im guessing that you are getting a bsod and yes it sounds like your pc needs more power, would you mind telling me the specs?

Quoted from doks

After starting a game – a few seconds in… PC restarts itself.
Doesnt happen with TF2, but with some other games that are more demanding on the graphics card.
PSU issue ???

My PSU had this issue; it would restart randomly when I opened applications. I fixed it by setting all the Windows visuals in windows 7 to basic.