Windows Mail was used with Vista. (It was basically Outlook Express, rebranded after a few minor tweaks).
Windows Live Mail is Microsoft's most recent free email client.
A few things to check:
1. Remember that usernames and passwords are case sensitive. (So 'rivel' is different to 'Rivel') ;
2. Remember that some email providers require you to enter the first bit of your email address (i.e. the bit before the '@' symbol) as your username, whereas some others require you to enter the whole of your email address ;
3. Sometimes a message telling you that your username and/or password aren't recognised has nothing to do with either them. Are you sure that you've enter the correct POP3 and SMTP (or IMAP) server addresses?
Chris