"Can't Find Server" message appears when i try to login

My internet's working and my messenger is alright but I
can't open my hotmail account. I sign in to my msn
messenger. It opens and says that u have this many new
emails. I click on the link and all of a sudden the
borwser says "Can't Find Server". smae thing happens if i
try to login to some other site such as tdcanadatrust or
some other site. The only site I've been able to log in
is yahoo. Besides that I can't login anywhere else.
Someone help me out!!!