when i tried to sign in with the windows live messenger, i am unable to sign in and says the contact list is empty ....but however when i tried to sign in with the windows messenger i can sign in. it's not that the problem is with my messenger. i tried one of my friends i.d and was able to sign in. it was working well till yesterday but all of a sudden i can't sign in today.and it's not that i upgraded to windows live messenger and this problem arose...it was working fine before.can anyone suggest anything ?

Only one thing, uninstall, delete any WLM folder from program files, restart, reinstall.

Good luck.