Hi. I have Windows XP Pro SP3 for a Dell 8400 computer. Before it had 2 GB of RAM and today I add 2 GB of RAM more, but in Windows System Properties it show only 2.25 GB RAM. ?? Am I wasting my money when I bought that extra 2 GB RAM? Why can't Win XP Pro see the entire 4 GB RAM? I check the BIOS and it show 4 GB RAM and System Information show 4 GB of Total Physical Memory. Any explanation? Thanks.1 person needs an answerI do too

Yes, you wasted your money. A Windows 32-bit operating system cannot utilize that much RAM. 32-Bit or 64-Bit - http://support.microsoft.com/kb/827218/en-us Lifehacker Guide to 64-bit vs. 32-bit Operating Systems - http://lifehacker.com/5431284/the-lifehacker-guide-to-64+bit-vs-32+bit-operating-systems Memory Limits for Windows Releases - http://msdn.microsoft.com/en-us/library/aa366778%28VS.85%29.aspxMS-MVP - Elephant Boy Computers - Don't Panic!

Also a good read: Pushing the Limits of Windows: Physical Memory