On Windows, the installation behavior of applications is very free and unpredictable. Usually, various files will be released in the system during installation and use, including program files, user data, cache files, etc. What’s more, various rogue components may be installed, and a large number of registry keys and values will be written into the registry at the same time. When it needs to be uninstalled, the uninstaller program that comes with Windows has just a single function and cannot completely cleaned them up.

Using general methods (via the Programs and Features in Control Panel, for example) to uninstall programs can not achieve thorough clear. In other words, there are still a lot of software files and registry entries remained in the system after uninstallation, which waste your disk space and make the system performance worse and worse.