You can use Edge as your pdf reader in the meantime.

My advice would be to uninstall Nitro Reader 3 at least for the time being, and use the built-in Microsoft Print to PDF function that is embedded in Windows 10. However, the post with the address was from 2013, and I don’t know if its still good. The suggestion above of contacting the developers is easier said than done, if you are using their free product! I eventually found an email address from another post on this forum, and I sent an email directly yesterday. As I say, I didn’t try this, but it may work. I didn’t try this but if you google something about “purge print queues” you will find some ways to get rid of the offending print jobs by temporarily stopping the spooler service, deleting the jobs, and restarting the service. So you may not have any restore points you can use. The solution I found was to use System Restore, but, for reasons unknown, I don’t believe this is activated by default in Windows 10. It locks up the print queues and even a restart doesn’t clear them. I ran into the same problem with Nitro PDF Creator. I can print to the Windows fax driver and the XPS document writer. When I try to use these devices, the source program goes into “Not responding” mode and just sits there. I upgraded my system on the first day and most everything seemed to go fine except for printing to my networked HP laser printer or a PDF printer driver from Nitro.

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