Stop and Restart for no apparent reason

  JF25 09:48 15 Jun 13

My computer has for no apparent reason developed a problem where it just stops and restarts telling me that windows has shut down and to choose how to restart. This is areal problem as I lose anything unsaved. At first I thought it was something on the internet but today it suddenly stopped while playing Freecell.

  JF25 11:50 15 Jun 13

Thanks Jock'1e, Time and date are OK PC is about 3 years old and has a tetra bite hard disk, overclocked. Do you think I should get a air spray and clean it out?
This problem is irregular and PC sometimes runs for hours with no problem and next time it will stop in about 10 minutes then again shortly after Thanks for your help. JF25

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