Thanks too !!! Unbidden, for finding this link to google groups and thank you James Dooley for this fix
To exit that app, run (Note that "/Close" is case sensitive): "\Program Files\Windows Media Player\wmpnscfg.exe" /Close
To make it not run again, open the registry key using regedit
HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\HME
and set the DWORD value DisableDiscovery to 2.
If you had a UPnP Media Renderer orcontrol point on your local network, you'd also be able to disable it by
right-clicking on its taskbar icon (which only shows if it finds a UPnP Media Renderer or control point)
and choose "Disable Future Notifications".
As to why it starts running when you've disabled media sharing, that's a bug in WMP 11 Beta2.