Can't access a wcf service from Windows 7, but I can from XP or Vista

I have a WCF service running on Server 2008 standard that works fine when calling from an XP client or Vista. I can compile the program (using VS2010, WPF) from an XP system and it will run fine on Vista or XP. If I try to run on a Windows 7, no luck. I also installed VS2010 on the Windows 7 sys开发者_开发问答tem and try to update the service reference in the project, I get the same error. "The document at the url http://192.168.0.242/AuthorizationService.svc was not recognized as know document type... - The request failed wit HTTP status 404...

Is there a difference in Windows 7 when creating and using a service reference than XP or Vista?