2gb usable ram 4gb ram

i have 2gb usable ram but 4gb ram does adding 2 more ram sticks mess anything up or should i just fix the usable issu how do i it
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More about usable
  1. if you are using a 32-bit windows that could be the problem try chaning to a 64-bit OS and see if that fixes it
  2. i am using 64
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