The Captain Sim 767 is know to be a bit hard on Graphics Cards. Since I upgraded my computer to what it is now (see my signature), this no longer happens with my 767.

The 707, on the other hand, is harder on my computer. But it does use HD textures, so that is to be expected. ;)

My old computer specs: Intel Core 2 Quad 9550 @ 2.83GHz | 8GB DDR2 6400 | Nvidia 1GB 9800 GTX+ | 22" LCD Monitor.

Mark