I updated from Windows 7 to 10 yesterday. My Canon MF4890dw didn't make it to the other side. It's not listed under printers. I suspect the "Unknown USB device" is my printer.
I downloaded the latest driver from the canon website. When I went to install, I got the error message, "An older version of the MF drivers exist in this computer. Uninstall the older version of the MF drivers, and then try to install again." OK, so I went into the programs list and installed the Canon driver and the Canon Toolbox. Right-clicked and removed (uninstalled?) the unknown USB device. Unplugged the USB cable. Rebooted. Still got the same error message when I tried to install the new stuff.
So I searched my C: drive for anything with the word "Canon" and "MF48". I deleted all files except for what was in "Recent" and what was in "C:\windows.old". I want to be able to go back to Windows 7 if necessary. Rebooted even. But still got the older driver error message.
Found the DelDrv.exe file in the Canon stuff I downloaded. Ran it. It said "No target device was found."
Searched online forums regarding similar issues. Can't find any answers for my situation. Can anyone help? What do I try next?