OK, most of those tools (NTREGOPT too) require a reboot to COMPLETE the process, but jv16PT's REGISTRY COMPACT tool gives the error (about the Security hive) FROM THE VERY START of the process.
Besides there's no problem if you don't check HKEY_LOCAL_MACHINE\SECURITY and after processing all the other checked hives the tool doesn't display a message to reboot neither!
That's weird, because all other similar applications do require a reboot to complete properly the process.
Is it a shortcoming of the author?
Hallo, jv16, can you give us your answer, please? :