Your system/Windows will not display the amount of ram correctly but it all
there. Just add the /3GB switch to your boot.ini to get the most out of the
4GB of ram. This option effectively gives 1GB for the OS and 3GB for
applications.
See: Memory Support and Windows Operating Systems
http://www.microsoft.com/whdc/system...AE/PAEmem.mspx
Available switch options for the Windows XP and the Windows Server 2003
Boot.ini files
http://support.microsoft.com/kb/833721