Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
When you go to the devices and printers window.. Have you tried right clicking the OLD printer, and then left clicking "remove printer" or "delete printer" ?
If you have already tried that and it wont let you remove the printer that way. It may be best if you and I connect during a screen sharing session, where I can fix the problem on screen, in person.
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.