From what I have read on other sites, many programs (not just FMS) have problems with a Win7 and Nvidia video combination. It sounds like Nvidia and Microdoft are too busy blaming each other to fix the problem.
My suggestion to all my clients is to stick with WinXP (32bit) unless you have a program that can only run in some other OS. I have downgraded a lot of new computers to XP.