Ghacks posted a tutorial about uninstalling Internet Explorer 9

Windows users who have installed Internet Explorer 9 recently on one of the supported versions of Windows, may at one point decide to uninstall Internet Explorer 9 again. A common reason for uninstalling the browser at a later time is if it is acting up and troubleshooting the issue did not resolve it.

Most Windows users can uninstall the web browser from the operating system’s Control Panel applet. Some users have however reported that the uninstallation does not remove the Internet Explorer version from their computer system.

  Uninstall Microsofts Internet Explorer 9 Completely