CM_PROB_WILL_BE_REMOVED
Device Manager problem code: 21
Description
This Device Manager error message indicates that the system will remove the device.
Error Code
21
Display Message
"Windows is removing this device. (Code 21)"
"Close this dialog box, and then wait a few seconds. If this problem continues, restart your computer."
Recommended Resolution
Select Restart Computer, which will restart the computer.
Note This problem code is transitory, and exists only during the attempts to query and then remove a device.
Article text from the Windows driver documentation (opens in a new tab), by Microsoft, under the CC BY 4.0 (opens in a new tab) licence.