I ticked on the up-date install and got a message that the 9.1 update seams to be installed.
As I've said, you need to be sure there's no BACKUP folder in the FS9 folder. If there is one, remove it.
If the 9.1 updater still refuse to run, you need to go through the repair route. You don't find a repair program in the CD1. Try to go into the Control Panel, as if you were to Uninstall FS9, then check if it offers you a repair option.
But, BEFORE you repeair, you need to REMOVE all the default MS .DLL from the MODULES folder, so the repair would be able to restore them and the 9.1 updater to update them.
Am I getting any further in getting my sceneries back?
The sceneries, as clearly indicated on the web site, requires the 9.1 update.
It's just that the older installers didn't checked before, but then we had to reply to support questions of users with 9.0, that wondered why the scenery wouldn't show up, and that's because the scenery works only with 9.1 so, even if there were no installer check, it woudn't work in 9.0 in any case.
I do not have a g3d.dll but still have the default GLOBAL & G3D dll's version 9.0.0.30612 in the Modules map
So, you have a g3d.dll and, as indicated by the properties, it's from 9.0. As I've said, unless you manage to properly install the 9.1 update, there's no chance the sceneries will ever work.
There might be another method you can try:
Do you have another PC or a friend with a PC to lend you ? Then, you can install FS9 there, don't install *anything* else, and then update it to 9.1
Once you have that FS9 updated properly, take the FS9.EXE from that folder, and all the .DLLs from the MODULES folder, and copy back to your FS9 installation. That might finally fix it...