In the System Preference> System group of icons, when you click on
the icon "9 Classic" what does the Classic preferences panel suggest
is going on? Do you have your Classic to run immediately on startup
of OS X? Are there any items in your User account's startup panel to
indicate you have somehow set Classic to start automatically on boot?
In Activity Monitor (OS X Applications> Utilities folder, or see GO in
Finder window and choose Utilities folder> Activity Monitor) see if
your Classic application is running. You may be able to force quit it
from Activity Monitor or from Force-Quit under the Blue Apple in the
Finder menu bar, if it is running and thus not letting you access or
change the Classic System 9 folder settings in Control Panel> Keyboard.
Per your other thread, have you a way to reinstall OS9-Classic from an
install disc, should you be able to remove the version in your Mac now?
When you run Disk Utility in OS X, have you chosen from the file menu
to run "fix OS9 permissions" and other options to rebuild OS9 desktop?
As I vaguely recall, you said you tried to Fix OS9 Permissions.
You may have to boot the computer from the installer OS X disc and
use Disk Utility from there to repair disk and repair disk permissions;
when done, quit the Disk Utility and choose from the Installer's menu
to restart using the Startup option in the drop-down menubar...
Then see if you can start up in SafeBoot (shift key held until login)
and then find if you can trash those System 9 folders; or change them.
When done in SafeBoot, restart. Classic will do nothing in SafeBoot.
Hopefully this thread won't run the course of your earlier one.:
"PowerBook G4 Doesn't see OS 9 discs"
http://discussions.apple.com/message.jspa?messageID=10576919
If you have OS 9 installed, then installing a different version is not advised.
Do you have OS9-Classic installer disc included with PowerBook software?
If you have OS 9.2 installer discs, you may be able to use Pacifist utility, a
demo download (or pay to keep using it after demo) to extract OS 9 and
install it even though the installer 9 disc won't directly install.
Good luck & happy computing! 🙂
{edited to add thread links}