Memory Remapping. M2N32 SLI Deluxe - wireless ED?

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I haven't got a clue where to start. I formatted and installed Windows 64 bit edition.

The OS is still showing 3.25 gigs only out of the 4GB installed.

Through googling I've discovered that I have to remap the memory used by the devices to above that of the 4GB available in order to get the OS/System reporting and utilising the full 4Gig.

I've flashed the BIOS to the latest version using the Asus Updater and after looking at the BIOS options I'm at a loss as to where I go to remap the memory.

The motherboard is an Asus M2N32 SLI DELUXE - Wireless edition motherboard.

If anyone has any info on how I can get Windows XP 64 bit to recognise all the ram I would appreciate it.

Oh! The price of my processor, (DualCore x64 AMD 4800+) since Intel CoreDuo 2 was released, has dropped significantly. As you might guess I'm extremely annoyed. :/