How a registry functions
When a Windows operating system is loaded onto a computer machine, a registry system is automatically created to record what settings, instructions, data files and other information are there in the computer. The registry acts like a directory of sorts to record all the relevant –and often the irrelevant—information for easier access by the operating system. Without a registry and the information are scattered at random in the system, the computer will take forever to go over, select, retrieve and use the required information.
Now it gets complicated
As you use the computer, updates to the softwares, file systems, panel settings and others are added to the registry, creating compounded associations of files and setting and instructions. Imagine a tree of interconnecting branches, different stems fusing into others, many not ending in leaves but into other stems, then you can have an idea of how convoluted such a registry can be. And if you know what a garden maze looks like…
Furthermore, when updates are made to any software or system configurations, the old files are not removed. They remain where they are, and although not used, are still accessed by the computer’s operating system each time you boot the machine. In other words, the operating system scans each file, determines if it is relevant to the operation at hand, retrieves it if it is and discards it if not, and proceeds to the next file, copying the needed file into the memory for use in the operation.
If you open an automatic update information as prompted by the system, you will see that there are many updates that are clearly superseded or replaceable by later updates. Yet they still will be loaded into your system if you are not careful and be selective in what you download. If your operating system is a rather old system, for example, and you update it only a long time afterwards, all the updates between your last update and the present will be loaded into your computer, regardless of whether they are obsolete, superseded, amended, or otherwise modified by new ones. As long as it is not there, it will be loaded.
In the end it creates a registry that contains much irrelevant and useless information which the system must take into consideration each time the machine is opened for use. This slows down the computer’s operation considerably, and eventually makes it crash if it gets too conflicting or heavy. A computer crash not only effectively stops the operation and thwarts what you are doing with it, but also endangers the whole system by corrupting the system itself. Too much conflict among the instructions and something is bound to give up somewhere sometime.
A registry cleaner scans the registry from beginning to end, eliminating the unnecessary and irrelevant entries, then closes up the gaps created. This compacts the system for easier and faster access by the operating system and your computer works much better. So you not only need a registry cleaner, but you should use it as often as weekly.