Hi Jungleace,
When FSX crashes it should generate an error report. You can view these reports by calling up the Windows "Event Viewer". Type "event viewer" (without quotes) into your start button search bar. On the left pane, open Custom Views and select "Administrative Events". Look at the ones marked "Error", at the time your sim crashed. That should tell you the module that was involved in the CTD, or at least give a clue to what happened. Let me know what you find out, please. Thanks.