Due to sudden CTD of my FSX installation that seemed to occur right after I installed an additional 8GB of RAM, I uninstalled the sim after it nearly drove me crazy rejecting every fix I could think of, and that my help could think of. Now my default, right-off-the-disk reinstallation of FSX is missing several cities in the "Scenery/Cities" file. They are areas 115 through 120 in the scenery.cfg. I didn't delete them, what could have caused them to fail to install? I've tried deleting scenery.cfg from the root FSX file and restarting the sim, no fix from that. Do I need to explore the FSX disk and lift the city files out of that and install them in the "Scenery/Cities" file? Please note this is not the "Addon Scenery" folder. I have not installed the Acceleration files from that disk yet, do I need to do that first? I am running Windows 7 SP1 Home Premium edition, I understand there have been many problems with this OS and FSX.