Cant log in to yahoo messenger

I would like to help you with your issue. but we have to check the following first

http://webmessenger.yahoo.com/ try log into the Web Messenger

> Step 1: Test Your Internet Connection
> Step 2: Verify Your Yahoo! ID and Password
Open Internet explorer and www.mail.yahoo.com
Check by sign in to you account
> Step 3: Test Your Access to Secure Pages
Make sure that you can access secure pages from Internet Explorer
Try to sign in to Yahoo! by going to the Yahoo! sign in page and enter the same Yahoo! ID and password you were using before.
> Step 4: Verify Credentials
Verify that the same Yahoo! ID and password you used before in the last step also works in the online version of Messenger, Yahoo! Messenger for the Web:
http://webmessenger.yahoo.com/
enter the same Yahoo! ID and password you were using before.
> Step 5: Check Connection Settings
Click the Messenger menu and select Connection Preferences.
Click Connect directly to the Internet, and then click OK.

Check by Changing the connection type to a connection via a proxy server:
Click the Messenger menu and select Connection Preferences.
Click Connect via a proxy server, then under this option, select HTTP proxy, and then click OK.


Last is Uninstall all the Yahoo Tool Bars and Yahoo applications , Yahoo Messenger, and Yahoo Updates from Program list i.e Control panel - Add/Rem Programs ..
And reinstall the Yahoo Messenger again -

Hoping the above info will be useful for you

Try creating a new account, or try the forgot password link.