when i first got the game it was all good but i decided i didnt want to play it again. now when i went to install it the installation went fine. game opens but then in order to play online u have to do the first update, when i do the update everything goes fine until i come to opening the game again. when i try to open the game after the update it says "LIVE gaming on windows has failed to initialize. this may be because another Live gaming windows application( such as halo 2 dedicated server) is running on the same machine. otherwise reinstalling the game may fix this problem" ive tried reinstalling the game way too many times now and still dont know whats the problem after the update, Can anyone help please