Hi Jeanne T. McCloskey,
· When exactly do you get this error message?
There is not much information provided by you. Post with the required information so that we can help you better.
If you are getting this error message when using Add printer Wizard then, I would suggest you to try the Microsoft Fixit and/or the manual steps from the following article link and check if it helps.
Error message when you use the Add Printer Wizard: "Operation could not be completed"
Look forward to hearing back from you.
Thanks and Regards,
Santosh Y – Microsoft Support
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