Windows 7 - MWC cannot find extender for xbox event id 539

Help. Trying to connect xbox with media center. I have googled this and tried everything I could think of. Here's what I got:

-Windows 7 Pro 64bit (legit copy) fully updated.
-SMC Network router (xfinity) with firewall disabled, upnp enabled.
-Computer and Xbox both wired connection into the router (temporarily removed an unmanaged switch between the 2).
-Windows Firewall disabled
-I build this computer, so no junk software, or antivirus installed
-have 2 admin accounts, no luck from either
-have windows file sharing, media share all on
-changed network from home to work
-allowed remote desktop connections
--turned on 3 windows services suggested by another post
-deleted the certificate for windows media center suggested by another post
**I rebooted and tried to connect after each of these steps one by one.


On xbox: can connect to network ok, no computer associated with wmc.

Basically it says "setup failed becase your extender is unable to communicate with this computer"

I keep getting either event ID 538 or 539. Any suggestions???