FSX fatal error after firing Missles

Hi All,I am working a mission in FSXAcc and have downloaded the Weapons pack, by Chris Sykes and others. After days of troubleshooting to determine the cause of FSX Fatal Error, (fe.dll); I finally determined the crash occurs ONLY if I fire the missle...tried Agm-88c, 12-c, and Sky Flash and all cause a failure. When I substitute bomb_c, I experience no failure! The failure is predictable as it always occurs about 4 minutes after missle firing. Have tried alternate routes, but same result. I slew to a different area, but get same results!I am running Win7 with 4 gigs of memory and a dual core cpu. I have tried running in XP mode, Vista mode, as well as Win7, but all experience the faulure. Has anyone sucessfully used any of these missles in a mission? What FS vesion are you running? What system are you running? Any other advise or reference to offer? Many thanks for all Input.Jake