A backup of the registry is essential BEFORE making any changes to the registry. If the changes prevent the system from booting up, then there is no backup available to restore it in order to regain functionality. Not all registry cleaners create a backup of the registry before making changes.
One cleaner may find entries on your system that will not cause problems when removed, another may not find the same entries, and still another may want to remove entries required for a program to work. Each vendor uses different criteria as to what constitutes a " bad entry".
There are a number of them available but they do not all work entirely the same way. Not all registry cleaners are created equal.For a more detailed explanation, read Understanding The Registry. The registry is also a vulnerable subsystem, in that relatively small changes done incorrectly can render the system inoperable.
The registry is a crucial component because it is where Windows " remembers" all this information, how it works together, how Windows boots the system and what files it uses when it does. Whenever a user makes changes to settings, file associations, system policies, or installed software, the changes are reflected and stored in this repository. It contains information and settings for all hardware, software, users, and preferences. The Windows registry is a central repository (database) for storing configuration data, user settings and machine-dependent settings, and options for the operating system.
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