Useable memory

I have windows 7 64 bit with 8gb installed memory. but it says that only 3.18 gb is useable. can make more of the memory useable and if so how do i do it?
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More about useable memory
  1. What motherboard do you have? Company, model, REV#...
  2. asrock P55 extreme
    on the windows base scores it says that 8gb is installed but only 3.18 is useable
  3. The board supports 16gb, what version of Win 7 are you running?
  4. i am runing the home premium 64 bit version
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