To enable registry editor that was disabled by some malware please do the following to regain access and perform maintenance:
Enable Registry Editor using Group Policy Editor
1. Click on the Start > Run and type ”gpedit.msc” on the field (without “).
2. Navigate to:
- User Configuration
- Administrative Templates-
3. On the option: Prevent access to registry editing tools
4. Click Disabled and click on the OK button to save settings.
5. Reboot your computer.