I installed a new windows xp home on a computer and upon entering windows I checked and it was showing 3gb of my 4gb of memory. So I went to the boot.ini file and added the /PAE switch to it. When I rebooted it, windows was showing 4gb of memory. Then I installed sp2 on the system. After it rebooted from the update it went right back to 3gb of memory. It didn't matter if I added the /PAE or no /PAE. Does anyone have any ideas. Thanks in advance!!