No I checked. When you enabled the streaming and sharing in the media center it changed them to auto.
The people who had them set to manual could no longer stream to other devices or share on their network from media center, such as their xbox and other computers.
When the services where put back to auto and running everything worked.
I tested on mine (Windows 7 64 bit) and when I setup the sharing the services where changed.
Media extender is what changes it.
Shane