I'm talking about FS9.... uninstalled and reinstalled it but didnt remove any settings or files and it still does it
That's normal, every uninstaller removes only what IT has installed, not what other installers did.
So, there wasn't any need to reinstall FS9, since all our sceneries have of course a proper Uninstaller, which also asks you if you want to remove the Addon Manager, which is exactly what I've told you to do, and this would have entirely removed anything, allowing to start FS9 normally, and correctly reinstall by configuring the antivirus correctly.
It FS9 still quits to desktop, it's because you haven't followed all the steps correctly. In this case, you haven't uninstaller KLAS, and/or haven't replied YES to the question "Do you want to remove the Addon Manager?" that the KLAS Uninstaller will ask at the end of its process.
when I try to start the installer for KLAS that it needs the 9.1 update, but then when I do the 9.1 update, it says its installed?
This because, not having removed FS9 entirely, there's still a "BACKUP" folder which was installed by the 9.1 updater, which is what the 9.1 installer checks to see if it's already installed. If you remove that folder, the 9.1 update will proceed.
Do I still do what you initally said to do?
Yes, of course, that was the only thing that you should have done.