Scenery addition problems

I have win7 professional with fsx deluxe sp1 installed.The problem I face is I cannot add scenery by any of the available methods for windows 7. Tried reinstalling and repairing fsx but that too was friutless. I really cannot understand what the issue might be coz if I add scenery, I can see it appear in the scenery menu but it is nowhere to be found while selecting airport(I have few airport sceneries).But the airplanes seem to load quite fine.I read 1 or 2 threads relating to similar problem but they too were useless.