how to enable or accelerate my asus k55vj notebook graphic cards

its Asus k55vj notebook and originally windows 8 when i bought it (i7,8gb memory ram, 2gb vram). then i bought a new harddisk to replacle it because the older one is not running anymore and now it is windows 7 ultimate. and now i can't install any high graphics games and it always says "the game can't be installed because your graphics card driver was not installed or unabled or not accelrated". but the truth is all the drivers are already installed according to the device manager. please someone help me... thanks
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More about enable accelerate asus k55vj notebook graphic cards
  1. ASUS do not have any Windows 7 drivers for the k55vj, so it's most likely a driver issue.
    http://support.asus.com/download/download_item_mkt.aspx?slanguage=en-us&model=K55VJ&os=36
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