Possible Duplicate:
How to enable 4GB in my Windows 7 64 bit?
My Windows 7 is 64-bit, and I thought that means it can use the full 4GB of RAM installed on the computer.
But I just saw this on my computer's properties: (So only 3.25GB is usable??)

Possible Duplicate:
How to enable 4GB in my Windows 7 64 bit?
My Windows 7 is 64-bit, and I thought that means it can use the full 4GB of RAM installed on the computer.
But I just saw this on my computer's properties: (So only 3.25GB is usable??)

This is usually down to either memory being shared against a graphics card or a motherboard limitation that prevents 4GB of memory being accessible.
Have you checked how much ram your video is sharing? Although with an experience score of 5.9 it's not too likely you are using on-board. Something to clarify in the details anyway.