Unstable windows 7 after upgrade

Hello,
after an install windows is very unstable monitor blinks off for a few seconds, will not allow download of drivers from nvidia, nor good install of games
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More about unstable windows upgrade
  1. system spec?
  2. if all you did was an upgrade install,

    click start type cmd
    hit enter
    type sfc /scannow
    it may ask for a windows disc if it finds problems so have on handy
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