CTD when changing 737NG airline configurations...

Hi Everyone - I've discovered another problem since installing FSX on my system. (The first problem of dying frame rates for PMDG aircraft was solved by running the path utility from the NOTAM posted here). Now, it seems that when I go to change the airline configuration in the 737NG, from, say, Southwest Airlines to Hapag-Lloyd Express, FS9 disappears/crashes to desktop. Upon restarting it, the cockpit config change is there. A couple of times I've also had to reboot the system because not all functionality was there - i.e., VORs not appearing on the ND, generator switches unable to be turned on to transfer electrical power after engine start.Everything worked perfectly before I installed FSX on a separate drive on this system....Has anyone else experienced this strange behavior after an FSX install?Thanks,Jim