Thanks. I wasn't able to find a web.config file anywhere on the server, so I created one in the root directory of my default web site and placed in it the information you included in your reply. I then restarted IIS. Nothing's changed.
When I browse to IP Address/index.cfm, I get an IIS 404 error --
The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.
When I browse to just the IP address, I get the CF error page. Browsing to any other folder or file within the default website also brings up a 404 error, although browsing to IP Address/cfide/administrator takes me to the ColdFusion Administrator.