Windows xp not recognizing 4GB ram

I am upgrading a computer from 2GB to 4GB ram. The BIOS recognizes the memory as 4GB dual channel interleaved, but when I get into windows it only shows 2GB.
The OS is Windows XP SP3
there is no onboard video controller
dxdiag tells me video card is an nvidia 7800 GTX with 256MB of ram.
I read about the video card address space issue but it doesn't account for the difference. It should still be at 3.5 or 3.75 GB available to the system.
I have tried enabling the /PAE and the /3GB flags in the boot.ini file one at a time and together.
I have also tried manually setting virtual memory to a different size as well as disabling it.
Any ideas?

Directly from page 80 in the Owner's Manual found @
http://www.dell.com/support/my-support/us/en/19/product-support/product/xps-dxg/manuals :
Addressing Memory Configurations
If you are using a 32-bit operating system such as Microsoft®
Windows®
XP, your computer will support a maximum of 2 GB of memory. If you are using a 64-bit operating system, your computer will support a maximum of 8 GB (2-GB DIMMs in each of
the four slots) of memory.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”

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