Windows 7 Freeware Airplanes not showing

I just upgraded from Vista to Windows 7. I had FSX running great in Vista. All my default planes plus some payware and free ware planes were fine. Now in Windows 7 some of my payware planes and all my freeware are showing up white on outside view and on inside view one can see only parts of the cockpit, etc.
Any ideas on how to resolve this problem?
Thanks all in advance,

My System: HP 6GB DDR2-800MHz dual channel SDRAM
768MB NVIDIA GeForce 9600 GS
Intel Core 2 Quad procQ9550
750GB 7200 rpm SATA 3GBs hard drive

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