MSN on Multiple PCs Problem

Hi everyone, I have a problem.
I have 2 PCs with MSN Messenger 7.5, but after i logged into one. The other one doesn’t longer work. I tried to shutdown the pc but nothing, it says the username and password are wrong. can someone help me?

The current messenger protocol on escargot does not support MPOP.
It’s not recommended to logon into 2 devices with the same login.

Ok, now it works fine