Windows XP in bootcamp won't recognise more than 2GB of RAM?

Hello.
I use a Mac Pro (2008) with Mac OS X (10.5.8) and I run Windows XP using bootcamp for games. I recently installed an extra 4GB of memory which Mac OS recognizes fine, but XP can only recognize 2GB.
Is this normal or does anyone know a fix/reason for this?
Thanks.

Actually, Windows XP on any computer can only address about 2.5 GB of RAM. Even on PC if you you want to use more you'll need Vista or Windows 7. Both version recognize ram on my PCs and Macs with Boot Camp. I use Home Ultimate and have no problems.

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