mmh, You can go online on Messenger's site ;P
Login Messenger Site
Its the MSN Log in, Just Login and when you are loged in.
1. Look the tab:
You must see Messenger, If you installed it Succesfull(no need to work)
P.S: sorry for other Language ! :S
2. Click 'Login in Messenger'
3. Once you are logged in.
=> Now you can talk ;P