How To Install Cod4 Multiplayer Online Leftover files & folders Though it is optional, it is still recommended to do it as a good practice of using your computer. This is an optional step, you can skip it and call it a day, but if you keep ignoring this every time you uninstall a program, your computer registry may become overloaded as such useless data accumulating, thus lead to system slowing down. When you installed Call of Duty 4 Modern Warfare - Patch 1.7, quite a number of entry & files were created in the Windows Registry (What is Windows Registry) and hard drive, while running the default uninstaller always failed to remove all these data, it leaves us to manually track down and delete the leftovers inside the computer.
