What should I do?

[Cave]

Old thread but had to be said.

FSX hardly uses your graphics card. A processer of at least 3GHz is reccommended to play FSX on decent settings.

And I reccommend downloading TweakFPS, as well as Game Booster and CCleaner.

I get 100FPS+ in FSX when using IFR - Best Performance mode in TweakFPS.

Also be sure to kill explorer.exe when playing FSX, this improves performance immensly.  You can open it again by using "New Process".