Media Center was working fine with 8 RTM. I upgraded to the 8.1 preview and it seems to have broken media center on my xbox360 extenders. I get the following error "Video Error - Files needed to display video are not installed or not working correctly." whenever I try to play live tv or anything else. I searched around and it seems like the same thing happened with W7 when SP1 was released, with no solutions. I was wondering if anyone else has encountered this, and if there are any solutions. Thanks. EDIT: Just checked my event viewer and found this: WMDRM-ND root license creation failed for Media Center Extender. Area: 2 Error: The parameter is incorrect. seems to me a DRM issue.