7800GT won't drive both monitors

I've just upgraded my system core as follows:
Mobo: ASUS P5WD2 Premium
uPU: Intel Pentium 4 3.2 GHz Socket 775
RAM: 2G DDR2
BIOS: AMI V08.00.10
HDD: Maxtor Y080P0 EIDE 80GB
VGA: NX7800GT
Monitors: 2 x Formac Gallery 2010
OS: Win2K Pro SP4
My problem is that I cannot get the graphics card to drive both monitors simultaneously (even before Windows has started), although it will operate either on its own (via the corresponding DVI port - i.e. both are working). I even managed to get it to drive monitor 2 (via DVI port 2) during startup by disconnecting monitor 1 temporarily during power up, only to see it switch back to monitor 1 (via DVI port 1) once the Win2K drivers had loaded and started.
What's frustrating is that while I was initially configuring the motherboard's BIOS in an attempt to overcome problems with reading my HDD, I managed to get the graphics card to drive both monitors (purely in text mode, because I couldn't get Windows to start), but cannot now recall the setup that acheived this.
Can anyone advise how I can configure the graphics card and/or my motherboard's BIOS to drive both monitors simultaneously?

Boffin,
Just to verify, you are using the Drivers from the nVidia Website, not the ones from MSI. If you are using MSI or have used MSI, run Driver Cleaner and then install the nVidia Drivers from the nVidia Website. Also make sure in Display Settings you extend your desktop to the second monitor.
If non of this helps, it sounds like it is time for a fresh install of Win2k or a great time to switch to a fresh install of WinXP.
Take Care,
Richard

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