My problem with KSEA scenery has been resolved.  Holger Sandman in the FTX forum suggested re-running the GTX Vector Configuration tool and the airport elevation tab.  Did this and KSEA is now OK.  Still have the virus in quarantine, and ACE for the 777 does not work.  Later I may try to get ACE to work, but for now will use the fuel and payload options in FSX.  Thanks for your help and quick replies.

Jim Kaye  :)