Windows Live Mail Error ID: 0x8004108C

Suddenly, my Windows Live Mail doesn't work anymore - ie it won't download any new messages, although I can still see the old ones.
I have Windows 7.

It keeps asking me in dialogue boxes if I want to go online (it doesn't normally ask me this)

Error message when I use drop down menu of Sync- all email accounts; is:

Unable to send or receive messages for the Hotmail.co ........... account.

 

Server Response: An error has occurred.

Windows Live Mail Error ID: 0x8004108C

Protocol: NNTP

Port: 0

Secure(SSL): No

PS:  I can still access my hotmail account through the hotmail internet site, so it's not a problem at source.

Help please!

Thank you