skydiver1 wrote on Feb 21^st, 2012 at 8:27am:

Hi Mark and NNewcomb,  Thanks for your quick replies.  NNewcomb,  I do have the FSX SP2 installed unless for some reason FSX doesn't recognize it now- can it be reinstalled with messing anything up?  Hmmm...    Mark,   How do I look up KB#685?  :-/  Thanks in advance  and again my thanks to both of you for your help.

Try uninstalling SP2 and re-installing it. If that does not work, You can try repairing FS with the disc, and as a last resort you can uninstall and re-install FS all together.