Messenger Problem

I was experiencing problem signing in to windows live messenger this noon, and thought that it was temporary. However, i tried a few times later but stil could not sign in. Here's the solution for the problem i found. Anybody experiencing the same error code as this "error code 81000451" could do this:

In Local Disk C:\Documents and Settings\USER-ACCOUNT\Local
Settings\Application Data\Microsoft

USER-ACCOUNT --> is your user account that you logged in Microsoft Windows.

SO:

1. - Find folder with name Messenger, and delete all files and folders in it,
2. - Also find folder with name Windows Live Contacts, delete all files and
folders in it, and it's done.

After performing these steps, problem solved. Well, at least for me.

*Credits to BinaryWorld for the solution*