I downloaded Fallout 3 a few weeks ago, and I've been playing it frequently without any problems. Today I tried to play it, and after I hit the "Play" button, a window pops up that says "The ordinal 5360 could not be located in the dynamic link library xlive.dll." Anyone have any clue to what that means?

http://www.gamesas.com/index.php?/topic/892715-troubleshooting-tips/page__view__findpost__p__15230022

Thank you!