can't sign in!!!!!

i constantly get a sign in error. nothing will fix it. re-logged in to all pc accounts steam and windows, logged into windows online, reinstalled game, reinstalled steam, removed mccconfig folder edited registry xboxlive section still cant play this (insert bad word here) game im so furious!!!.. deep breath. can someone help me get this fixed. as gaming is how i keep in touch with friends back home and this is what we are currently hooked on playing