On Windows 11, you can restrict access to the Registry in at least two ways using the Group Policy Editor and, ironically, with the Registry Editor, and here's how.

If you see Cannot import Registry File, Not all Data was successfully written to the Registry error, you need to follow almost the same guide as mentioned above.

Open the Start menu and search for regedit then press Enter to open Registry Editor. Navigate to the folder name below (you can copy the text and enter it in the address bar at the top).