I am having trouble with Windows Live Mail.  It keeps asking for my password over and over again.  I will close out of Mail on my Windows 7 PC, then try again later and the mail will come down fine.  This is very frustrating.  I have even tried to re-enter my password into the properties tab.  Why does sometimes the mail comes down fine and other times the password screen comes up?  Once the enter your password screen comes up, it will never connect.  Here is the error message:

Unable to send or receive messages for the Windstream 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 [IN-USE] account is locked by another session or for maintenance, try again.
Server: 'pop.windstream.net'
Windows Live Mail Error ID: 0x800CCC92
Protocol: POP3
Port: 110
Secure(SSL): No