Windows Messenger and MSN Messenger are two different programs, yet they act
the same. All you do is remove all access to Windows Messenger.
Go to the options and disable it to run at startup. To access MSN Messenger,
click start, go to run, type msnmsgr (not msmsgs) and press enter. Set that
one to start up when your computer starts up. If you don't want it to
automatically start at startup, click Start, Search, find msnmsgr.exe,
right-click, and send to desktop as shortcut.