CMS 2001 and CMS 2002 cannot exist on the same server. As a result, you must uninstall CMS 2001 before running the CMS 2002 installation process. Uninstalling CMS 2001 is as simple as going to the Control Panel, picking Add/Remove Software, finding CMS 2001 on the list, and uninstalling the application. Depending on your implementation, you will have one or all of the following: the server, Site Builder, and Site Stager. In a standard implementation, CMS installs in X:\Program Files\Microsoft Content Management Server, where X is the drive on which you installed the server. Be sure to uninstall all components of CMS 2001 before running the CMS 2002 installation process.