Shell Extension Manager
If you find that clicking on folders or files in Windows Explorer unexpectedly cause it to freeze or crash, the problem may be related to shell extensions installed with new applications. Many will have noticed that WinZip adds an option to zip selected files or folders when you right click on them in Windows Explorer. This is just one example. Such shell extensions may remain even after the applications they are associated with are uninstalled.
Nirsoft's Shell Extensions Manager provides a solution to this problem. It will generate a list of all shell extensions installed in your Windows operating system and allow you to enable or disable them.