I just got a XPS with windows media-center edition.  I cannot get the laptop to  play streaming audio from XM radio or  Sirius Radio .   It will not play through either MS Media player or IE.  It acts like it will not connect to the stream.  All documentation points to adjusting the network settings in MS Windows Media Player.  I cannot access the Network tab  under  MS WMP to adjust the settings.  I can play other streaming audio but not these.  Any help would be greatly appreciated