Thank you for your response..
Sorry for the lack of info.
The CTD occurs around 10-20 minutes when flying in Canada.. I can start a takeoff roll from CYMX (Mirabel) freeware but as soon as I'm airborn, the sim just freezes with the mouse blue circle mouse cursor (indicating to wait) and then the simulator automatically resets....
I understand that msvcrt.dll is used for many programs, addons, etc.. but the problem only started after I installed GSX and CYVR.
Not blaming FSDT or anything, I just thought that this would be a good place to start asking for help