Error message when you try and connect an Xbox 360 extender up to Windows XP Media Center Edition 2005 with Service Pack 3: "There is a problem with the installation of Windows XP Media Center Edition 2005"

This is due to a registry setting missing and can be fixed by downloading a fix from Microsoft 895961 which corrects the error "The Windows Media Center Extender service cannot create the sub-desktop session on a Windows XP Media Center Edition 2005-based computer"