Any video card experts out there? (see details for problem)

I have a Windows 7 system with a Radeon 4650 (came with it) and a FireMV 2250. The 2250 needs to be the secondary (has two projectors attached), but every time I log out or reboot, it takes over and becomes primary again. I had it working at one time – I remember it took HOURS to get it right and I think it had something to do with re-installing the physical card, but I don’t remember. Someone messed with it (he SAID he only changed the screen resolution) and now I can’t get it back the way I need it. Does anyone know how to force the older card to be primary? When I first boot up the “starting Windows” screen comes up on the proper monitor, but the login screen shows up on the projectors. Thanks!