WLM Won’t Let Me Sign In

About a week ago all of a sudden my Windows Live Mail started asking me for my user name and password. It's not accepting my password, I keep getting a message that says it's invalid. However, at the time I hadn't changed it, since then I've logged into my email on the internet and changed the password to see if that would work. Nope. I've tried googling the problem to no avail. I haven't seen anything in the forums that has helped yet. Randomly it will decide to receive mail, but I haven't been able to send mail for a week now. When I open WLM it automatically asks me for my email and password. I put them in and it sits there and authorizes for ages, then asks me to put it in again. This continues on an endless cycle until I hit cancel, which is when I get the error message that my password is incorrect. I don't know what to do anymore. I'd just get rid of the email, except it's the main email for the front desk of the resort I work for. It's on all of our information, so getting rid of the email isn't an option if this can be fixed. Please help!