System Hangs on a Vista

My computer is a Dell XPS 420. I am running on a Windows Vista Operating System. Recently I have been experiencing system hangs. My computer would just hang randomly with a black or grey screen. Can anyone help me out?
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More about system hangs vista
  1. Does it hang at startup or at shutdown times? Garry
  2. gwb56 said:
    Does it hang at startup or at shutdown times? Garry


    At random times when I'm using the computer or while playing games..
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