Only seeing 2 GB memory (Windows XP Pro SP2, 32 bit)

I have 4 GB installed on my Mac Pro (early 2008). It's running Windows XP Pro SP2, 32 bit). The System Information says I only have 1.99 GB of RAM.
I understand that 32-bit Windows can only see up to 3 GB of RAM. But I'm only seeing 2 GB. (For example, I have a MacBook Pro running 32-bit XP and it sees 3 GB).
In Mac OS X, I see all 4 GB, so the RAM is probably seated properly and fully functional.
Any help? I saw another thread about the same problem, but that was Vista.
thanks
Edit: I CORRECT MYSELF -- This computer has been updated to Service Pack 3.
Message was edited by: mikenmar
Message was edited by: mikenmar

Hello Hatter,
Long time no chat
Do you have any info. on how Windows 7 will behave in the Mac Pro scenario?
My MacPro has 12 GB RAM crammed into it, I'm running XP-Pro 32 bt SP3 - and I too see only 1.99GB RAM in my XP environment. I have no troubles at all seeing all 12GBs in Leopard 10.5.6. I gave up on VMware Fusion after realizing it completely ignored my QuadroFX4500 graphics card.
Now I'm running in pure BootCamp for any/all of my XP needs - which is only to run SolidWorks on my Mac. (SW's tech supp doesn't like me very much - I think they've flagged my account as "one of those Mac freaks" - I digress...)
I'm hopeful Windows7 64bit will be fine and thus will allow SW to see more of the RAM my beast contains within.
Thanks in advance for any thoughts you care to share.
Peace,
wd

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