How to let XP system to support 3.25G?

I installed the technical depth of GHOSTXP Pro V9.0 is the
I installed SP3 is the 4G of memory installed note several systems are to support 3G, I use the MSI P45 board who can tell me how to set up In order to allow the system to recognize 3.25G
I would like to thank the

XP system on the highest awareness of 3G memory regret ah ~
Landlord wants to play a 4G memory capacity can only be installed VISTA can identify the 4G of memory! First installed XP, install the upgrade to Vista, and then uninstall Vista to XP.

Not work, Windows 2003 Server can only use the.