Problem using 2 Video Cards - Windows 7

[aLi3nZ]

I just purchased and installed a 256mb PCI FX5500 video card. My Primary video card is a 8800GTS

I am able to use both the FX5500 or the 8800GTS fine separately with windows 7.

When I try to install either card while using the other then I get one of two errors - either Windows has stopped this device bacuase it has reported problems. (Code 43) or The device cannot start (Code 10)

System Specs:
Nvidia PCI-E 8800gts graphics card
Nvidia PCI FX5500 graphics card
2GB RAM
ASUS m4n78 mother board
X6 1055t CPU

Troubleshooting already tried
>Putting the FX5500 video card in a different PCI slot
>I have tried uninstalling and installing the FX5500 PCI card with both the default windows 7 driver and the latest nvidia driver several times.
>Updated both video cards to the latest driver

Any ideas?

 

[aLi3nZ]

I have been doing some research. To get 2 video cards to work with Windows 7, they both have to be supported by WDDM 1.1. So I am going to sell my FX5500 and buy a PCI 8400gs.

A little bit frustrating since I don't need a secondary video card with gaming performance like that. In the past I had a 4 monitor setup with Windows XP using a 8800GT and a ATI Radeon 9200.