"Problem: I recently bought an old G4 Quicksilver with single 867 MHz cpu, running OS X 10.4 Tiger, and LOADED! with applications such as Final Cut Pro, Final Cut HD, Adobe Photoshop, CG3, MS Office for Mac 2008, etc., but no installation disks."

The last few words are where we see that you didn't obtain such legitimately. Sadly there are folk that sell machines "loaded" and the message is not sent along that you don't have the rights to such software.

If you did you would have all your product keys and CDs. If you had proper rights you can get replacement install media for cheap.

Hope this clears this up. Bob