Since basically everything is contained there that determines how programs perform, and what you see on your screen, it can cause a lot of grief if you are not aware of exactly how everything is tied together. Your registry is set up in different ways depending on which version of the Windows operating system you are using.
Because of the complexity of the registry, if you were to eliminate some aspect without awareness of how it might affect another program or display, you can cause greater future problems, or cause your system not to operate properly, or not at all. The first thing to remember before ever making any major adjustments to your computer, it is a wise idea to create a ‘restore point’ on your hard drive.
The Windows system makes it very easy to create a point to return to if something goes wrong, and it is a good idea to run one on an automatic basis. This way if an installation or removal should go wrong or cause a problem, you have not lost everything. Most registry scanners have become quite efficient, so you can use them with full assurance that all will be well.
Some of the signs you will see that will indicate it is time to clean your registry might include your machine will take longer to start up or is slow to shut down when your turn it off. You are likely to see error messages popping up. Finally you may see programs locking up, and having to be restarted, or your computer may outright crash.
This is simply because of the fact that as you use the computer more often, you will be adding and deleting programs and getting frequent updates. These will begin to accumulate in the registry and some information will remain, even when properly deleted.
Registry cleaners are the most efficient tools to get into that very sensitive area and keep everything running smoothly and efficiently. By running it regularly you will find you have the ability to remove the troublesome areas and thus have a more stable and secure system.