whenever i go into live mail  a pop up has started asking me for password.  i've been using livemail for 2-3 years and never needed a password.

Unable to send or receive messages for the Btinternet **** account. An incorrect password was entered. The next time you send or receive messages, you'll be asked to enter your user name and password for this account.

Server Error: 0x800CCC90
Server Response: -ERR [AUTH] invalid user or password
Server: 'mail.btinternet.com'
Windows Live Mail Error ID: 0x800CCC92
Protocol: POP3
Port: 110
Secure(SSL): No

i've reset my password but it still says it's incorrect

it seems i can still send e-mails but am not receiving any