Shoutbox

My messenger live plus is not working properly, like i have three accounts on my computer and on two of them i can sign on to messenger without a probelm. but on my main account every time i try to sign in the troubleshooting popup option always pops up so i click it, and everything gets a check mark saying that it's working , so i click repair anyway, but when it trys to sign in again the same thing happens. Please Help ME. (the error code for it is 80004005).