Hey Peter,
ERUNT (The Emergency Recovery Utility for NT) and ERUNT.GUI are indeed separate programs, with ERUNT designed to back up and restore the Windows registry, while ERUNT.GUI provides a graphical user interface for ERUNT.
When it comes to using ERUNT.GUI with Windows 7 x64, you shouldn't encounter any issues if ERUNT works fine on your system. Typically, if ERUNT functions properly, ERUNT.GUI should work without the need for modifications on a Windows 7 x64 system.
If you have already applied workarounds to ensure ERUNT works with your Windows 7 x64, you should be good to go with ERUNT.GUI as well. You can try downloading and using ERUNT.GUI without additional adjustments.
Feel free to proceed with downloading and using ERUNT.GUI...