Registry editing has been disabled by administrator.

 Virus takes control on regedit

Firstly, check the local admin group to make sure you are the only one who has the local administrator privilege.

Secondly, update this Group Policy to restrict access to Windows Registry editor Regedit.exe. You can do this by

1. Press WIN + R, type gpedit.msc, and click OK to launch Local Group Policy Editor.

2. Navigate the left panel to User Configuration → Administrative Template → System

3. Double click Prevent Access to Registry Editing Tools at the right panel, click the Enable radio button, and click OK to save the settings.