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Without more info, it's all a guessing game > INFORMATION REQUIRED WHEN POSTING A QUESTION
If this is a clean install of Windows 7, the most common cause of graphics/driver issues is a OS severely out of date. Until Windows Update tells you that "There are no more updates for your computer"...you must continue installing the available updates...these will include the 'optional' updates.
If you are having issues updating, read this > Windows will not update after a fresh install