配置部分的系统。无法读取servicemodel，因为它缺少节声明

I have somewhat of a problem. My old webserver (windows 2003) have been replaced, with a 2008 R2. I have been given an admin account on it, and can do whatever I want, but I am no expert on this area. I configured the roles to have application developement and Web server (iis7).I have somewhat of a problem. My old webserver