Hello All, slightly confused, Windows live mail refuses to accept my password as correct even though i know that is my password 100%.

I first loaded it up and went to add my hotmail account and it said the password was wrong even though i was originally 99% sure it was right, i then changed my password just to make sure, when returning to live mail, it continued to say it was incorrect, then i tried the online version, which works fine (windows mail AND outlook), why is the desktop version not working for me? Thanks in advance!