Thank you ever so much!
I was getting woried as I had a really bad spyware on my old computer...they were getting all of my passwords! I browsed the internet for this problem and I noticed that a few other people were having the same problem with MSN/Yahoo, so I wondered what it was.
Thanks you ever so much guys! You saved my old computer and taught me a lot of things!
Ben27
(If anybody that I know has a problem, I will straight away recommend these forums with joy!)