MSN Messenger 4.7

I have MSN Messenger 7.0 installed and running on my XP Pro computer right now. However, when I’m not logged into 7.0, MSN Messenger 4.7 will automatically log itself in in the background without me knowing about it. I try going into the Add/Remove Programs to remove it but it’s not listed. I can not find any program files for 4.7 that I can uninstall. Therefore does anyone know how I can disable or uninstall 4.7 so it will stop logging itself in automatically?