ati video driver s

I am running a Dell Optiplex GX280.
The main card is a ATI Radeon PCIe x300 / x500 Series running a Dual Head DVI configuration. The second is a Radeon 9200 SE which has a DVI and VGA out.
However unless something has changed, I have read that VISTA wont support both of these cards at the same time- whereas XP did.
So unless someone knows how to get a PCIe and PCI card both working with non WDDM drivers (are there even any?), can someone provide me another option to get these 3 LCD's working
Thx