Installed programs aren’t managed by the operating system, like mobile apps on Android and iOS are - although “Modern” Windows apps do work this way. They’re not even managed by a package manager like they are on Linux, where the package manager keeps its own list of the files it installs. Instead, the installer is free to do whatever it wants to your system. Typically, installers will create a directory in Program Files as well as scatter shortcuts around the system. They’ll also add information to the registry. Some programs that need to integrate more deeply with the system may dump DLLs and other files into the Windows folder or install system services. Third-Party Uninstallers For Specific Programs When a program launches, it may make additional changes to the system’s registry and future updates may add additional files elsewhere on the system. Many antivirus programs have a problem uninstalling in the normal way. For example, uninstalling Norton or McAfee antivirus from your Control Panel may not remove everything from the system. That’s why these antivirus developers offer dedicated removal tools that you can download and run to really purge the program’s files from your system. Antivirus programs often run into this problem because they integrate so deeply with the system. Third-party uninstallers attempt to exercise control over the uninstall process, removing what the official uninstaller misses. When you use a utility such as the widely-known Revo Uninstaller, it generally runs in the background and watches what an installer does when it installs the program.
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