Another Solution for Windows Live Messenger Sign-in Problem

Open Regedit by issuing "regedit" in Start-->Run

find and delete the following key:

HKEY_CURRENT_USER\Software\Microsoft\MSNMessenger\Policies
(delete here means just highlight Policies and delete, not to delete the whole string/path)

if you can't manage to find "Policies" under the indicated path, which means this solution will not work for you :-), myself is a good example...I can't find "Policies"

Another work-around will be the following, please click on the below link
http://wingcom.multiply.com/journal/item/428

if you still can't get yourself sign-on, try using the windows messenger(not LIVE) that comes with windows, just go to Start-->Run then type msmsgs and login from there temporary. Try signing-in Windows LIVE messenger later

note: if you are in a company and can't sign-on successfully, it might be a reason that your administrator has already block msn port...in that case...try web messenger