ShellExView scans your PC and then displays the details of all the shell extensions that are currently installed, and allows you to disable or enable any of them. You will also be able to solve effectively context-menu problems in the Explorer environment.
Shell Extensions are in-process COM objects which extend the abilities of Windows operating system. Most shell extensions are automatically installed by the operating system, but there are also many other applications that install additional shell extension components. For example: If you install WinZip on your computer, you'll see a special WinZip menu when you right-click on a Zip file. This menu is created by adding a shell extension to the system.