Well let me ask you this 1st
do YOU actually have the original FSX Disks
IF You do,,, reinsert the Disks,, and there is an option to "REPAIR" you FSX ,,, follow the instructions.
but - be kinda careful, as any changes you might have made to any Default Aircraft,, might change back to original Default,,, , so you might want to copy & paste those into another SAFE Folder area away from FSX,,, and re-install them back AFTER the repair is complete,, if, that's Applicable to your situation
