Error code 21
View all device and driver errors
CM_PROB_WILL_BE_REMOVED
Windows is uninstalling this device. (Code 21)
Cause
Windows is in the process of removing the device. This error is temporary and exists only until the device is completely removed.
Solution
Either wait for Windows to finish removing the device, or restart your computer. If you still have the same error, uninstall the device using device control and then scan your computer for hardware changes.