1. First, ensure that your computer is connected to the Internet.
2. Confirm that your password is not hacked by loging into your yahoo email account with the same user ID that your using to login to the yahoo messenger, by going to
http://mail.yahoo.com.
3. If you are able to log into your email account, your ID is safe.
4. Try to kill yahoo messenger on your system using "Task Manager"
5. To open Task Manager, right click on your computer's task bar at the bottom and click on "Task Manager".
6. Next, click on the "Process" tab in Task Manager, select "YahooMessenger.exe" and click on "End Process" button.
7. If you cannot find "YahooMessenger.exe", then select "Ymsgr_tray.exe" and click on "end process".
8. Now start your yahoo messenger again and try to login. You should be able to login succesfully.
9. If your Internet connection is fine and you have followed the above-mentioned process and still cannot login to yahoo messenger, your system's fire wall is probably obstructing yahoo messenger to access internet.
10. Change the necessary settings on your firewall to leverage access to yahoo messenger.
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