Have you ever wondered what happens behind the doors of a registry cleaning software? What sets a good program, such as RegCure or ErrorSmart apart from the rest of the crowd? What makes them tick? This is what we are going to talk about today.

Registry cleaning programs are fairly sensitive software. They work with data that is crucial to your operating system's behavior, and must handle it with extreme care. Furthermore, making changes to your system's registry must be done with equal care, so as not to corrupt the registry. This is why such programs have to be thoroughly tested.

A registry cleaning program essentially has two modules: a scanning module and repair module. The scanning module is the one which reads your Windows Registry files and tries to determine whether they have a problem or not. When a complete inventory of the detected problems has been made, the repairing module comes into play, fixing all the detected problems. It sounds simple, but in fact it's a lot more complex than you would imagine.

The most complicated module is, quite surprisingly, the scanning module. It may sound as a paradox, but in fact it is not. The reason why the scanning module is so complicated has to do with the definition or an erroneous entry in the registry. What is an erroneous registry? One that has an incorrect format, like a key which should have a string value, but it has a number value, or one whose string value exists, but is pure gibberish? Of course, both of them are errors, but how would you detect the latter?

This is why registry cleaning programs look for two kind of errors. The first ones are generically called 'format errors: key-values associations that do not have a correct format, like the one mentioned above. These errors are fairly easy to detect and not very complicated to fix. However, if the fix is incorrectly applied, they can lead to registry corruption.

Other errors are the so-called content errors. These are more complicated to determine, because wrong content is much more difficult to detect compared to meaningless content. Imagine you are a teacher who is looking at pupil’s homework. You can instantly detect a meaningless answer, such as scribbled lines and signs that have no meaning in English, you need not even read the answer (fairly obvious, since it's nothing for you to read). However, detecting a wrong answer requires not just reading an answer thoroughly, but also knowing the correct answer in the first place.

In order to detect content errors, registry cleaners need to have an index of known problems and methods of solving them. However, there is a catch here as well: some content errors are impossible to distinguish. Indeed, even the best registry cleaners, like RegCure, which has the largest database of content errors, can only solve inconsistencies in the system-related entries in the registry.

Although the repair model has a fairly simple model (just a set of fixes for known problems), its implementation is by no means simple. These difficulties are to be expected any intervention in the registry has to be done with extreme care, because binary file formats are much more susceptible to becoming corrupted when erroneous data is written.

Regardless of the completeness of these two modules, a registry cleaning software is very difficult to write. This is why many of the famous programs of the mid 1990s eventually faded into obscurity: the market eventually settled for the best programs. Most experts agree that, at this moment ParetoLogic’s RegCure is the best option It is a proven, mature solution which can fix almost anything that can be fixed. But most importantly of all, it can fix problems without causing any problems of its own.


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