In one corner of the screen ?

Sirs, I'm having a problem with the "Validation Menu" (Free Flight) when LEAVING through "End Flight". It ends up in the corner of the Screen (Monitor). Then  when pressing Esc to exit It Crashes to desktop (CTD) with a Fatal Error message, Then a Restart Message. I have tried a lot of remedy's and nothing seems to clear the problem. Any Idea's would be great. Thank You.