Http://localhost/ brings up previously installed web server

I have a machine running Windows Server 2003 Standard Edition on which Oracle 9.2 is installed, and among the Oracle components installed is an Oracle HTTP server. I have a web application I want to run that is configured to run on top of Tomcat 6.0. I installed Tomcat 6.0 and created a CATALINA_HOME environment variable pointing to the Tomcat 6.0 dir. Opening a browser and pointing it to http://localhost/ still brings up the Oracle HTTP server home page. The 'Apache Documentation' link from this page reveals it is running on 'Apache HTTP Server Version 1.3'. What I would like to do is configure this machine such that localhost points to Tomcat 6.0 and not this old Oracle HTTP server.

I assume somewhere is a windows configuration file or setting that controls where localhost points to (?)

Other information:
- In the windows services control panel I can see that the 'Apache Tomcat 6' service is running.
- If I stop the 'OracleHTTPServer', pointing to localhost brings up a 'Cannot find server' error.

I've searched Google Groups and Tomcat documentation and have been unable to find an answer. If someone could provide some advice (or suggest a more appropriate newsgroup to post this query) I would be most appreciative. Thank You.