WCF Web Service deployment problem

Hi, I created my first WCF Web Service which works fine from the local IIS. I installed the service into an existing asp.net website and the service shows up when I try to reference it from a project. The error that keeps coming up is: The content type text/html; charset=UTF-8 of the response message does not match the content type of the binding (text/xml; charset=utf-8). When I used fiddler to see the html which is being returned, it is the screen that comes up when I browse to the service in IE which tells me how to set up the service in VS and with svcutil. I should be getting the return value from the service and not that screen. There must be something wrong with my setup of the service in IIS or in that site. I need someone to call into my machine and help me get past this. Thanks, Ed