Some Windows Phone users being hit by c101b001 Marketplace ...
Jan 21, 2012 . i allso get the errror code on xbox but if i open the zune client it show . and in may 2011 i was inveted to try zune for free for 14 days and after .
http://wmpoweruser.com/some-windows-phone-users-being-hit-by-c101b001-marketplace-error-for-nearly-a-week-already/