Maybe the Process Killer killed something on your system that it shouldn't have. Try uninstalling it and uninstalling FSX and reinstalling FSX. If you have a lot of texture addons and stuff, I suggest saving a second Aircraft.cfg to a different file for each aircraft you have texture addons on. 5FPS is pretty bad. 11FPS is OK. My system runs on a steady 6FPS with graphics on low which is why I'm getting rid of FSX, getting FS9 and a new computer that will run FS9 good. GOOD LUCK!!!