Hoping that my response will stimulate someone who has a proper answer.
All we have in common is Win98SE. The printer I assume (too lazy to look) is a multi-purpose job scanning and printing.
I suggest you remove any trace of your printer old or new via control panel.
Then reboot.......... Computers are simple single minded slaves and sometimes need a chance to reset before accepting new instructions.
On reboot the screen should show the "found new hardware" and eventually will challenge you to find the installation disk.......
The other way is to insert the installation disk at the desktop stage and follow the prompts.
Understand that madness is not far off, and you should be out enjoying the lovely evening. (Well its a good one out of my window!)