Windows 7: Extender Setup Error

I use my WMC, to watch videos on my xbox360. Recently when I tryed to reconfigure my Extender on my pc, I get the following error, after I enter the 8 digit number:

Configuration Error:

An error was encountered while configuring your computer for use with this Extender



I am on a wired connection, no Firewall present. I recently checked my event viewer, this is the error I received:

Event 7000, Service Control Manager

The Media Center Extender Service service failed to start due to the following error:
The service start failed since one or more services in the same process have an incompatible service SID type setting. A service with restricted service SID type can only coexist in the same process with other services with a restricted SID type. If the service SID type for this service was just configured, the hosting process must be restarted in order to start this service.