Panicked with Quark problem!!

I'm using Quark 4.11 and OS 9.2.2. I can open a Quark document by double clicking it on the desktop, but once opened I cannot select anything on the page. Most of my tools are greyed out. I can save or save as, but cannot open other documents through the menu. I need to revise two Quark files by morning... and I'm frantic! Any suggestions?

Also, when I open Quark I keep getting a message saying: "a copy of Quark with serial number (11 digit number) is already running on this machine." I did have previous versions of Quark installed, but I trashed them when this happened. (I just updated to Quark 4.11 from Quark 4.0).

Can anyone help?

Thanks so much!!!

Work through the list and see if it makes a difference

Trash QuarkXPress preference file
Disable extensions
Disable font utility (if applicable)
Disable system extensions - restart while holding down shift key

If all else fails…trash all of QuarkXPress, install 4.0 and then apply 4.11