Scripts that directly trigger rstrui.exe to revert the entire system to a previous healthy state.

Tools often include scripts to copy backup files from the C:\Windows\System32\config\RegBack folder to the active config folder.

A "Manual" or "Advanced" mode that lets you browse the structure of a damaged registry file and extract only the healthy keys.

The primary feature for any "Lost Regedit" utility is the ability to restore missing or corrupted registry hives (databases) that Windows needs to boot.

If the registry is severely damaged, look for features like:

Integrated tools like Scanregw.exe or third-party equivalents can scan for invalid entries and attempt a real-time resolution. 3. System Integrity Checks