Q: Apple wireless keyboard 'driver error' windows 10

Did yo install the Boot Camp drives for Win 10?

Use Windows 10 on your Mac with Boot Camp - Apple Support

The same is for me.

I installed bootcamp the both to a mac mini, and everything works fine there (wireless keyboard too), but for the installation onto a macpro late 2013 everything works fine, WI-FI, GPU, wireless mouse, BT, etc. all of the drivers are OK, with the exception of the wireless keyboard where the bluetooth manager says: Driver Error.

Resolved!

You have to go to "Device Manager" (right click on Start: Device Manager option), at the HID leaf (that stands open 'cause of a  driver error), simply uninstall and delete the wrong driver. Magically everything works fine, and the wireless keyboard will be reported on the Keyboards leaf of the Device Manager.

Tell me if it works for you too.

Doesn't work for me sadly...

This didn't work for me. I have exactly the same problem. It says "driver error" for the keyboard, while the magic mouse works fine. If I delete the driver, it shows a "System Administrator's Keyboard" is connected with bluetooth, but the keyboard still doesn't work.