My specs:   Dimension 8400, 3.2 GHz processor, 3 Gig RAM, Win XP

I bought an EVGA 640 GT to run 3 monitors, but Win XP is only recognizing 2 at a time.  MS says XP will support up to 10 monitors, but have found no way to activate the 3rd monitor.

Can XP support 3 monitors simultaneouly (without using Matrox TH2Go).  If so, how do I set  it up?

Thanks,

Joe