When you use the keyboard shortcuts to Load Hive (ALT+F and L), the Registry Editor exits. The Application event log contains:
Source: Application Error
Event ID: 1000
Description: Faulting application regedit.exe, version 5.2.3787.0, faulting module regedit.exe, version 5.2.3787.0, fault address 0x0000c865.
Event ID: 4097
Description: The application, C:\WINDOWS\regedit.exe, generated an application error The error occurred on date @ time The exception generated was c0000005 at address 0100C865 (regedit)
To workaround this issue, use the mouse to select Load Hive.