Try downloading revo uninstaller ( so it will clean the registry of any printer software) depending on the machine, and chipset will depend on the driver needed for the Universal Serial Bus controller. You need to identify your motherboard and download the proper driver.
There could be several other issues here too, but this may be the best place to start not knowing many of the other details.
1. Did this just start happening ? Did you install some other software that broke the printer?
I suggest completely removing all printer software and isolate the "unkown device" error first
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