I tried many times to import a *.reg but always got "an error occured in the application". Even with a small and simple file. Even with a file that was exported one moment before from regalyzer. What's wrong there? (newest program-version with XP SP3)

When I try to search the registry (simple substring search), the program gets in an endless loop in key "HKLM/System/Currentcontrolset/Enum/ACPI/FixedButton" I have to kill the program with the task manager.
I tried this unsuccessful years ago and now again with the latest version - searching is still not possible here (XP SP3). Starting the search after this key does work.
Does anybody have hints?