Sorry about my post above — I mistakenly posted it after accidentally cutting all the new content out. Here's what it was supposed to say:
http://cgi.ebay.com/New-Apple-Retail-OS-9-2-1-Install-Cd-Classic-Manual-etc-/310 318490539?pt=LH_DefaultDomain_0&hash=item48406c63ab -------------that is exactly what my install disk looks like and has the same os (in the bottom left you will see Version 9.2.1 on it).
That disk can't be used at all on any 17" Powerbook, because to use the installer on the disc, the computer must start up from the disc — and no 17" Powerbook can start up in any version of OS 9. That disc can only be used on computers that can start up in OS 9 without OS X installed. Yours can't.
You must install support for Classic mode — that is, install a non-bootable configuration of OS 9.2.1 or 9.2.2, I'm not sure which it was — from one of the discs that were originally shipped with your Powerbook. There is no other way to do it, and no other source CD from which to install Classic support on your machine. A while back, it was still possible to order duplicates of the discs that were shipped with your Powerbook by calling Apple Customer Relations at 1-800-767-2775 (in the USA), but Apple hasn't had any stock of those discs for computers as old as yours for years now.
If you don't have your original discs, the last resort for you will be to find another Mac that already has Classic support installed, and copy the System Folderfrom that machine onto the root level of your Powerbook's hard drive. After doing that, the first time you try to start a Classic application, you'll see a message that Classic support files need to be updated, and if you're connected to the internet, you can click OK and the update will be carried out through OS X. (This is exactly where you got stymied before, because the System Folder you had copied from the OS 9 installer CD didn't contain everything necessary to support Classic.) Then your Classic app will open. If I remember correctly, four files will be added by the update, but I don't recall what they are. They are essential to Classic operation, and without them you can't run any Classic app, even in Tiger (OS X 10.4.x).
In Leopard, even if you have Classic support installed as a leftover from when you were running Tiger, you won't be able to use Classic mode or run any Classic application, period.