Bedbug, and others, there is a solution to the flickering issue with FMS and Nvidia graphics - see this link: http://n.ethz.ch/student/mmoeller/fms/f ... =12&t=5867
This does work, though it's somewhat annoying to complete successfully - stay with it - follow the instructions carefully. I believe this will also work with Vista.
I had been trying to get FMS to work on my W7 64 bit machine for a year before finding the above solution. While it did solve the flickering, it also brought my framerates down to 6-12 fps, which is a slide show. Tried to solve that new issue for several days, and then gave up on FMS on that machine. Normally I'd have had 60fps with FMS on any computer. The other eight sims on that machine - top pay sims and freeware - anywhere from 60 to 1600 fps. No idea why!
Also, look at RC Desk Pilot - new and free, and Clearview $40.00, but well developed and continuously being updated.