Dual Monitors on nVidia Geforce ti 4200

I have a NVidia Geforce 4 ti4200 with two monitors plugged into it. I am trying to work out how I can use Flight Sim 2004 on both monitors, but for some reason as soon as I enable the second monitor (using Dual-view mode in the NVidia settings) then when I start Flight Sim, it complains that my video card doesnt support hardware acceleration and that it is starting in software mode.Does anyone know how to setup this video card so I can use it with hardware accel still working??BTW Flight Sim 2002 works perfectly!