Problem adding xbox 360 as windows 7 media center extender over wireless

Question

Trying to add XBOX 360 as Windows Media Center Extender on Windows 7 Pro machine. I have completely disabled Windows firewall and wireless security, with no luck.

To troubleshoot, I have:

• Disabled Windows Firewall completely
• Disabled Wireless Authentication & Encryption
• Same problem on multiple computers
• Verified that I have no problems over a wired connection.

Here are some other factors:

• Router/Access Point is Linksys Wireless-N Broadband Router WRT160N
• Using latest version of AVG Free on computers. Have tried disabling resident shield.

Here is the error I am getting on my pc:

Answer 1

Solved problem. I needed to go here and allow my xbox:

Then needed to check types of media that I wanted to share:

Answer 2

Based on my research and experience the "Configuration Error" problem occurs for a variety of reasons. Here are some of the common ones.

1. Corrupt Media Center Certificate.
2. Corrupt Default User Profile.

I solved the problem in my case by re-establishing the permissions for the Default user profile in c:\users\Default so that the administrative group had full permissions.