What is the BEST Registry Cleaner for Win 7 Ultimate or Pro 64 Bit version OS ?

There are rules, but if the software maker doesn't abide by them..............

@Palcouk:

I assume there are rules on how to use the registry. It is not about the actual data, but about how it is written to the registry.

It is not about what is going on in the computer. The registry is a kind of configuration file, and in the more then 40 years I have been working with computers, I have always taken care that my configuration files were free of junk and well organized. It greatly reduced problems I can assure you, because if you feed a computer junk it will produce junk. The famous junk-in junk-out principle.

It may well be that third party software producers do things with the registry that were never anticipated by Microsoft, and are essentially wrong. But the again, had Microsoft build a registry maintenance utility, this wrong use had been discovered.

Nothing can be designed to deal with unknown programs and what that unknown program makers installation procedures write to the win drive.

This could be done if the operating system was locked down by the o/s maker and only o/s maker approved programs could be installed.

There are many people who are obsessive, perhaps to a fault, over control over everything that goes on in their computers.  Even when informed by knowledgeable people that registry "errors" are harmless they insist on "cleaning" anyway, not as a matter of improving anything but because they need to invoke control.   If you think that Microsoft can anticipate and identify all of the detritus that any of tens of thousands of programs might leave in the registry and develop methods for cleanly removing all of them for the sake of obsessive people, you are expecting too much, I think.