The Registry Drill is the world's most powerful and in-depth Registry utility and cleaner. This is the tool the pro's use, with 50 different Registry tools to fix any Registry problem. The Drill has even has an Auto Clean and a Search and Replace tool designed so even a Novice can use them. It can reset Registry Key permissions for you and it can repair most corrupt Registry files with it's Load Hive tool.
The Drill also has a Deep Drill. It goes through the Registry character by character searching for any possible errors. It goes through the entire Registry slowly and carefully, looking for more than 50 different kinds of errors; a blank Key, a pointer to a non existing Key, a non existing file, invalid characters, and more.
The Quick Drill which quickly searches the Registry for 15 different possible types of errors that other Registry cleaners do not.
It has a Find Write Time tool as well as a Find NoRead and NoWrite Keys, Find All Pointers to a file and many more tools.
The Registry Drill's help file, walks you through any repairs you may need to make and carefully explains which errors may be valid. It explains why a Key is invalid and what information is missing or wrong.