32 bit limitations on windows OS’s is a big concern for older systems. How do i know if I have 4gb of ram in my system, that I’m actually able to allocate it to my applications?
Depending on the OS version, it may vary on how to modify the boot files for it. Check out the links below for more inforation!

Windows 2000/ XP machines….  3G




Windows server 2003 machines……  /3G /Userva=3030