Have a due core and it takes 4 gig ram when i put windows 7 on will only that 3

my due coe always took 4 gids of ram and when intstalles windows 7 64 bit will not run on 4 gigs of ram only runs on 3 gigs what can i do
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More about have core takes windows
  1. Are you sure your Windows7 is 64 bit? Do you have onboard video using your system memory?
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