Shoutbox

Start your computer's control panel, (usually Start > Control Panel) then select either "Add or Remove Programs" or "Uninstall a program".

Wait for the list to load.

Once it does use the screen to uninstall both "Messenger Plus! Live" and "Windows Live Messenger" by double clicking on these programs and following their uninstaller.

Now in Windows Explorer go to the directory where you install your computer programs (most likely c:\program files)

Delete any of the following folders that you see. Windows Live, MSN Messenger, Messenger Plus! Live, Messenger Plus! 3, Messenger Plus! 2, Messenger Plus!.

Reboot your computer.

Start your PC back up and go to http://download.live.com/?sku=messenger and download Windows Live Messenger and install it.

If it works you may install Messenger Plus Live! from www.msgplus.net if you so wish.

Does this resolve your problem?