The foundation of the entire Windows operating system is the registry. The registry contains commands and keys that provide instructions to the computer on how to operate. If any of the important values get deleted from the registry, it can cause your computer to become very unstable, and may even cause it to crash altogether. Your registry also keeps a record of everything that is done on your computer, so it can become cluttered with useless information and cause the computer running slow. If your computer has become unresponsive or sluggish and you’ve determined that the registry is the cause, the next step would be to clean the registry and remove any infected keys or values.
Manual registry cleaning is only recommended for advanced users, due to the complexity and sensitivity of the registry. If even one value is inadvertently removed or altered, it can cause a complete crash. The registry can be very confusing for first time viewers, so I would recommend that you find a good registry cleaning software. There are many variations of registry cleaners out there, but be leery of the ones that claim to be free. Often, they only scan the registry, show you where the problems are, and then ask for an upgrade to the full version in order to perform any actual cleaning. Sometimes, software claiming to be a free registry cleaner is actually malware in disguise, so be very cautious in what you decide to download. Paid registry cleaners also offer technical support if you run into any issues.
If you want to attempt to clean your registry manually, then a free computer check up is a good starting place. This type of software doesn’t make any changes to your registry keys, it simply scans your registry and reports to you. It will give you a list of all of the potential clutter and malicious values, and it is then up to you to decide whether or not you wish to remove those keys or values. It is absolutely essential that you create a backup of your registry, and a System Restore point, before you alter or delete anything. Be careful! If you are not absolutely, one hundred percent certain that it is safe to delete a registry key, the best course of action is to leave it there. If, after manually cleaning your registry, you are still experiencing problems, you can always then find a paid registry cleaning program.
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I also recommend using a registry cleaner to fix registry errors. It is to risky to perform manual registry clean.