FSX Lockup, and AA That Runs Away

Grrrrr, I just made a flight in my F-5E Tiger II from KLSV to KEDW - I landed (with 0% fuel, this was a flight I wanted logged in my logbook), switched to spot view, where the graphics appeared as if I had AA turned off.
This only happens at photoreal sceneries such as the X-Pack KEDW.
Also, upon switching back to the VC, it froze, making me ALT+F4 out.
This has happened with multiple aircraft - whether they be the F-18A Hornet from the x-pack, or the Alphasim Tiger or Pavelow.
Any fix?
I use an Nvidia 6800GTX.
This only happens at photoreal sceneries such as the X-Pack KEDW.
Also, upon switching back to the VC, it froze, making me ALT+F4 out.
This has happened with multiple aircraft - whether they be the F-18A Hornet from the x-pack, or the Alphasim Tiger or Pavelow.
Any fix?
I use an Nvidia 6800GTX.