Thanks,
It is actually not the default aircraft, missing parts of the folders. It is the aircraft I obtained (downloaded) after the date to which my PC restored itself (about a month ago). So, the aircraft I got in the last month had stripped Aircraft.cfg files.
Also my scenery.cfg file was changed to the file I had a month ago, so all the scenery I loaded in the last month had to be reloaded.
I seem to be OK now after reloading the scenery and the aircraft files from the back-up I have.
Interesting though that the PC restore does this to FS. Apparently components of the FS files are held as shadow copies and these (old files)are placed back to FS when the restore takes place. Additionally, for some reason the Aircraft.cfg files are stripped from aircraft files obtained after the last restore point date (interestingly the .air files in aircraft file stay?)
Thanks god for the back-up I have. Recommended to all.
Thanks again for looking into this one.
Regards,
Peter