It isn't letting me sign into Windows Live Messenger?

When i sign on to msn it says

'signing into windows live messenger failed because account permissions could not be verified'

help..?!

It isn't letting me sign into Windows Live Messenger?microsoft net framework

reinstall messanger

It isn't letting me sign into Windows Live Messenger?windows xp themes internet explorer

Do you have MSN installed on more than one computer in your home, because its not practical.