Windows thinks I have 32Gb of RAM installed

[keyboardface]

You should take this up with the motherboard manufacture. It is reporting incorrect values for memory.
Windows only knows what the hardware tells it, and it is telling it there is ~32 GB of Hardware Reserved memory.

However, any support seems unlikely as the board is from 2005 with no drivers for Windows 7 let alone Vista.
There is a BIOS update released in 2008, however, F120: GIGABYTE GA-K8NXP-SLI | Emaplaadid - BIOS

Damn, that's annoying. Incompatible with Windows x64 it seems.

And to stormy13, I already have those nForce drivers installed but thanks anyway.

It looks like I'm stuck with those strange problem for now, but thanks to everyone for their suggestions.

 

[Layback Bear]

I would suggest going here before installing Windows 7.
Download details: Windows 7 Upgrade Advisor

 

[keyboardface]

Never did solve this. Probably isn't a problem, just bugs me everytime I see it.