You tried to uninstall the printer driver by uninstalling it from the Control Panel (search for a software which is named like your printer or printer manufacturer).You use Windows with a user which has administrative privileges.
I assume you already tried the following steps with no success (you should try these first if you did not encounter a problem and just want to get rid of your printer driver): The printing queue is not empty.“ or “ The driver is currently being used.“ (I translated this from an actual German error message, so it could read different in English versions.)
In my case, Windows 10 threw up an error message which read “ Driver cannot be uninstalled. However, it wouldn’t be Windows if that would work flawlessly under all circumstances. In the digital age, with switching locations and offices frequently, it may be necessary to uninstall a specific printer driver or printer port under Windows 10.