Well in answer to your question your best bet is to first download a programme called avast home edition. If you have a trojan or anything that collects data this will get rid of it in a flash when it does its first scan which is when the computer system boots up once you have installed the programme. If the problem still continues then you could have a programme which i can’t remember the name of it but it stores any password onto your computer and usually sends it to some a*hole who finds it pertiucularly funny to do stupid things to peoples msn names.

I no about this because I have had the same problem happen to me. If you wan’t you could always do what I do know which is make sure that it asks you to reset the pass word ever 72 days or somthing like that I think next time you change your password.

And yes msn does notify you that either your password has change etc. because like I said it happened to me. But that is what I did and since then I havn’t had anything wrong with my computer or my msn :).

This is the link to downlaod avast anyway hope it helps you 🙂
http://www.download.com/Avast-Home-Edition/3000-2239_4-10375520.html?tag=lst-0-1 just click download and you’ll be on your way 🙂