Shoutbox

Well here goes,
On my sisters computer my dad wants to get rid of msn messenger just for the moment whilst their exams are on, in an attempt to get them to study (lost cause if you ask me lol) instead of talk to friends and waste time.
Anyway we uninstalled msn messenger fine but there is still that little pain of Windows Messenger which in the end meant we didnt achieve anything.
I do not really want to uninstall/get rid of it cos I have read its a pain and your not supposed to do it anyway right?
Well what i am asking is can you disable it or something like that. Or how about hiding or deleting the shortcuts to it in program files? Would that solve it? Also will it still come up when you visit hotmail cos i hate that...

Thanks for listening anyway and hope someone can be of some assistance.
Daniel