MotherBoard/Video Card Question

Here is what I have...

I have a K8N-DL ASUS Motherboard.
Card (in case it restricts me somehow) MSI NX6800 Riddick - pci-e

The main slot for video is pci express... the video card allows me to run two monitors with two outputs: pci express & TV-out/DVI-1 which I have added an adapter for the second monitor.

The problem is... I want to run a 3rd monitor by using one of the white pci slots with a 2nd video card, but it will not run the 3rd monitor when I install the 2nd video card. In fact, the 2nd video card becomes primary when it is in and the pci express is not even found by windows.

Someone mentioned to me that an IRQ address could be assigned from the BIOS, but I don't know how or what to do with that.

If you could please help and instruct, I would greatly appreciate it.

Thanks for your time and effort,

Wackyrich

 

This OS is Windows XP Pro