I HAVE BEEN TRYING TO SEND MAIL USING MY MICROSOFT LIVE MAIL ACCOUNT BUT IT GIVES ME AN ERROR MESSAGE :

The connection to the server has failed.

Subject 'BECOMING A BUSINESS CUSTOMER'
Server: 'smtp.comcast.net'
Windows Live Mail Error ID: 0x800CCC0E
Protocol: SMTP
Port: 25
Secure(SSL): No
Socket Error: 10013

I AM ABLE TO SEE MY RECEIVED MAILS AND MOST OF MY OTHER INFORMATION. IT APPEARS THAT I AM WORKING OFFLINE, SO I THEN TRY TO SIGN IN AND IT SAYS MY USER NAME AND/OR PASSWORD ARE INCORRECT, TRY AGAIN LATER. I THEN ATTEMPTED TO CHANGE AND UPDATE MY ACCOUNT WHICH SAID IT WAS SUCCESSFUL, BUT IT STILL WONT WORK. PLEASE HELP ME!!!