Registry Cleaner: Is Really Speed-Up The PC Or Fix Crashes?

Registry Cleaner: Is Really Speed-Up The PC Or Fix Crashes? 

The Windows Registry is a hierarchical database, which stores configuration settings and options on Microsoft Windows OS. The kernel, device drivers, services, Security Accounts Manager, user interface and third party applications could able to make use of the registry. So, Windows Registry is a huge database for settings, which is not for Windows only and included the programs you installed. 
 
When installing a program, the program's settings will be saved on Windows Registry. If the program is registered as a default program for certain file types, then Windows will save a registry entry and remembers, it's a default program. For any reason, if you like to uninstall the program, then the program will be uninstalled but program's registry entries will be stayed on Windows Registry until you've to reinstall Windows or cleaned them using a registry cleaner / delete them manually. 

A registry cleaner will perform a scan on your system's registry entries, which appeared outdated and removed them. The registry cleaner companies make you to trust that their products would result a big performance and the system gets some incredible improvement on speed. In fact, registry cleaners would not speed up the PC, instead they may cause problems by removing registry entries. 

They often make false promises such as fixing registry errors and system crashes, system's registry has full of junks and even they repair blue-screens and so on. If your Windows PC crashes or blue screening then nothing to worry about registry and the registry, itself, is corrupted then it may corrected by using System Restore, at least.  

The registry is a massive database, where hundreds of thousands of entries gathered and individual entries are fairly tiny. The Windows registry has also become more robust nowadays, evolved from Windows 95 till Windows 7 and 8.  If the system is hideously slow or crashing frequently, then it may have other problems than a full registry and you've to refreshing the PC or reinstalling Windows.
Many registry cleaner distributors recommend to run their product once in a week; but an average registry cleaner may cause problems than it fixes, if run on a regular basis. 

So, forget the registry cleaners; make your life with basic care of your Windows computer and you don't have to worry about the registry.