passwords & web

hi, i am having a problem on Internet Explorer and MSN
explorer. on the internet when a web page, such as email
(hotmail), requires a password it doesn't work. it either
goes to a page like perfectnav.com or an error page. also
outlook doesn't download hotmail emails. when signing in
to MSn Explorer, it keeps attempting but doesn't sign in.
the internet is connected, but passwords seem to be the
problem. any help would be appreciated. cheers tom.