OMG, I'm sorry but wow. They are two seperate programs. Why would one installation affect the installation of a completely different program? C'mon... I really don't mean to hurt your feelings, but it's literally common sense here. Windows Messenger is old, MSN got really full of ads now, but there's Dexter's version or the Mess Patch from www.mess.be. If you don't want to use either, use Trillian, or GAIM. By the way, Google makes your life so much easier...