You can try adding "/PAE" to your boot.ini file to increase the amount of RAM windows XP sees, but SP2 should by default already being using the feature.
Right click My computer > Properties. See if it says "Physical Address Extension" at the bottom of the page on "System Information".
The big draw for 64 bit windows is the increase in the amount of memory windows can use. For example, I dual boot XPSP3 32 bit, and Windows 7 64, my machine has 8GB of ram. XPSP3 can see 3.24GB of that, while windows 7 can see all 8 GB.
If you want to run more than 4GB, switch over to a 64bit OS.
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by: leewPosted on 2009-11-05 at 13:23:16ID: 25754194
This is a 32bit technological limitation and is, in part, due to how memory for devices is mapped by the computer. For a detailed technical explanation, see: arkrussino vich/archi ve/2008/07 /21/ 309207 0.aspx
http://blogs.technet.com/m