I use a windows 7 pro Dell Optiplex 380. It is used for only one program (for work) and had 2gb memory. The computer said there was 1.73% usable memory before the memory upgrade. I upgraded the memory to the max of 8gb and now the computer says there is 2.86gb usable memory. Is this normal? The memory was doubled and what looks like a small increase in usable memory. Where did the other 6gb memory go? When I upgraded the memory a message came up that the computer recognized a memory increase and asked me if I wanted to enter SETUP or start windows normally. I picked start normally. Should I have done something else? The memory properties is as it always was "let windows determine what is best for this computer".