So, always run your Registry cleaner after uninstalling programs. If the previous antivirus is not removed completely and properly from the system then the new antivirus software may read the registry keys of the previous antivirus and may assume that that software is already installed on the system, and therefore may not install as long as that entry is present in your Registry. For example, we know that only one antivirus should be used at a time you had an antivirus installed on your system before but now you are trying to uninstall it and install another one in its place. The registry entries left by previously uninstalled software could interfere with the new software that you are trying to install. Removing invalid Registry entries is a great practice. You’ll see performance impact only if there were thousands of invalid registry keys and errors on your system. Registry Cleaners are not very helpful in improving the performance of the system. The main aim of Registry Cleaners is to remove the invalid registry keys, shortcuts, and other types of errors. It also keeps the settings about how Windows behaves. It contains information about various users that are created for the system, and the programs and Windows preferences of those users. The Windows Registry is a hierarchical database that contains information, settings, and options about all of the software and hardware installed on the Windows Operating System. Best Free Registry Cleaners Software and System Optimizers for Windows Windows Registry

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