Steve M wrote:So now I am trying to figure out how and where to give the file permission to download to sim objects/ airplanes. If you have any suggestions I would love to hear. Or should I just reinstall to drive D and hope permissions disappear?

One way over this is to install your 3rd party aircraft into a special folder outside the FSX root directory. This folder can have any name you wish & be located anywhere on any drive on your PC. (This works in WinXP & I see no reason why it won't work on other versions of Windows.)
For example: Create a new folder on your C: drive & name it Addon Aircraft. The path to this folder will be C:\Addon Aircraft
Install your 3rd party aircraft into this folder in the usual way. Finally, edit fsx.cfg to add the new location.
Under the [Main] header add the following line (in red):
[Main]
User Objects=Airplane, Helicopter
SimObjectPaths.0=SimObjects\Airplanes
SimObjectPaths.1=SimObjects\Rotorcraft
SimObjectPaths.2=SimObjects\GroundVehicles
SimObjectPaths.3=SimObjects\Boats
SimObjectPaths.4=SimObjects\Animals
SimObjectPaths.5=SimObjects\Misc
SimObjectPaths.6= C:\Addon AircraftI've been using this method since the early days of FSX. I have several sub-folders in my Addon Aircraft directory which allows me to check out lots of different aircraft without cluttering up the FSX Select Aircraft menu. These sub-folders can be activated/deactivated at will with a simple edit to fsx.cfg.