c++ buffer over time

hi all got this last night and fsx crashed can any one help
Buffer overrun detected!

A buffer overrun has been detected which as corrupted the program's internal state. The program cannot safely continue execution and must now be terminated.

this all happend one i conected my matrox to fsx i got a message first
saying your computer has run out of memory and sying somthing about the settings
so i lowerd the settings and than got this message i must add when i was running 2 monitos strait from my nividia 9600gt with the same setting it was working ok any one what i should do:(