There are a few reasons why you would want to clean out the monitor data that exists on a PC, for example monitor data included with the imaging process and falsely marked as active monitors.

With all version of the Windows there is no built-in way to clean up monitor data. Therefore these manual steps are needed to fix this issue.
Before beginning download and install Subinacl.exe .

Open an elevated command prompt and execute the following command.
subinacl /subkeyreg HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAY /grant=<Domain>\<User Name>=f

Open Regedit, and browse to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAY

Delete the Display key.

It is important to reboot the PC at this time. This will allow the OS to recreate the display key with the appropriate data and to reset the security on the registry key.