When the Windows Live messenger open pop-up message :
"Windows Live Messenger could not sign you in becouse the Windows Live
ID you entered does not exist or is incorrect.
If you have forgotten your password, click Forgot your password? at the
bottom of the main Messenger window.
Error code: 80048823"
Click on the Help button, then will open new window in
you can choose "Confirm your credentials then
MSN Account Services"
In next window press "Sign Up"
then will open form to confirm your e-mail address (Yes, use my
e-mail address) and click Continue. After that
fill your personal information and click
Continue.
Last step is to write your e-mail address and press I Accept.