I am running FSX ona Dell 720 H2C quad core and was getting great performance. Now - allof a sudden, when I click on something like the GPS button in the Cessena, the frame rates drop more than 1/2 and the mouse icon shows THE "ROTATING CIRCLE" like it is waiting to execute the command. The same thing happens on the LD767 when I try to open the FMC. The FMC is black as the computer tries to load it inand FPS drop to single digits off (50 fps). A quick llook at the outside plane and it has no detail. I also see the main FSX screen flash up for a split second and go away.Any clues? The only thing I recently did was to try to O/C 1 more setting to 3.78 GHtz. The computer crashed and I set it back to 3.48 Ghtz. I doubt there is a connection? FYI is I load any plane and don't click anything,I get great performance. But this stinks because I need the FMC, throttle quad, GPS etc.Please help.

This problem has been resolved. I did a system restore and all is back to normal. It seemed a update or configuration changed caused the system to go unstable.