Most games not responding on my newly installed windows 8

Recently I installed win 8 and increased my ram to 4 gb on my desktop but then most games such as the entire assassins creed series and gta stop responding after launch. i tries everything on google. i updated all programs yet no hope.
I have an intel dual core 2ghz processor, 4 gb ram of which only 2.9 is usable which i dont understand, win8 64bi with a radeon hd5800
3 answers Last reply Best Answer
More about games responding newly installed windows
  1. Most like your RAM. Did you set the timings correctly in the BIOS?
  2. Post your build - every component - make and model. Plus OS

    Is the ram compatible with the mobo per the mobo website approved memory (or QVL) list?
  3. Best answer
    There was another similar post about high density DDR2 RAM not working on an LGA775 board, similar issue.
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