ERUNTgui

ERUNTgui is a graphical user interface for ERUNT (Emergency Recovery Utility NT), a classic, free third-party tool designed to completely backup and restore the Windows registry. While built-in Windows Registry Editor .reg exports fail to overwrite in-use system files, ERUNT bypasses this limitation by making direct copies of the core registry “hive” files, ensuring a flawless recovery even if Windows fails to boot.

Important Compatibility Note: ERUNTgui is an older utility optimized for Windows NT, 2000, XP, Vista, and Windows 7. If you are running Windows 10 or Windows 11, it may fail to capture all modern registry components or throw errors. For modern operating systems, relying on System Restore points or tools like Tweaking.com’s Registry Backup is highly recommended. Phase 1: How to Safely Backup Your Registry

ERUNTgui simplifies the command-line utility into a basic visual program. Follow these steps to log a perfect snapshot of your hive files:

Launch as Admin: Right-click the ERUNTgui executable file and select Run as Administrator. This grants the program access to protected system hives.

Choose Backup Location: The software will suggest a default target directory (usually inside your Windows file path). You can click the browse button to change this to a safe storage location, like an external drive.

Select Backup Options: You will see checkboxes for System registry, Current user registry, and Other active user registries. Check all three boxes to guarantee a comprehensive full-system backup.

Execute: Click the OK or Backup button. The application will freeze momentarily while it reads and duplicates the core hive data. A success notification will appear once the process completes. Phase 2: How to Restore Your Registry (Standard Method)

If a software installation, virus, or bad tweak corrupts your system settings, you can use ERUNTgui to roll back to your clean backup state: Windows Registry Ruined | Don’t Have Backup – Microsoft Q&A