new aircraft display issue

I'm not sure what happened. I haven't flown MSFS9 in some time. I have recently installed XP SP2 (bout a month or so ago).Now when I go to "Select Aircraft", often times the aircraft displayed are missing major textures...anything from the fuse to the whole plane...just shiny dull tan color. Then when I select a plane that looks right in this display, sometimes it comes up the same way. Sometimes missing fuse (or half of the fuse) textures, sometimes missing wing textures...my Piedmont AFG YS-11 has no textures, tho the stock plane does. The .cfg file looks right in all the planes I've looked at.When I rotate thru the views with "S", the external textures will sometimes "come and go" with each cycle thru. Sometimes the fuse is missing part of the textures, sometimes the wings are "tan"...it's all very odd.Something is very corrupted here. Am I looking at a full reinstall here? Reinstall just the planes? Either way, it's a lot of time and effort. I have done a defrag also in the meantime since resuming flying.Any guesses? Many thanks...DaveKCOS