Windows 7 64bit 4gb RAM yet only 2.46 usable

Ive read other posts on this, but they all seemed to be people running 32bit OS's.
Ive got 4gb RAM installed, and Windows sees this. I upgraded to Windows 7 64bit and at the start it was using the full 4gb. Something has changed in the last week and it only shows as 2.46 gb usable and 4gb installed. If i disable detection in the bios and use discrete. it goes up to 2.9gb
Can anyone help me as there is 1.5gb being wasted somewhere. I run with switchable graphics set to high performance.

The T500 will for sure show 2.46GB if you're running switchable graphics and a 32-bit OS.
The key point is verifying that the system is indeed 64-bit.
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