Computer saying that my keyboard is in use by anther application..

Computer is running on Windows 10. Keyboard is a Williams Legato. No interface I just use an A to B usb cable, a printer cable. The keyboard didn't come with companion software. I never had a problem until recently.
sounds like an installation of something has messed up your drivers. Maybe reinstalling the drivers will fix it?
Cant you remember what software you installed recently that may have caused it?
 
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