Can't sign in to Windows Live?
"Follow the links below to get help signing in to your account. Hopefully, it is as simple as resetting a forgotten password. But if someone has broken into your account, or if you are having technical problems…"
If you have forgotten your password you can reset your Windows Live password and use Windows Live Validation to take back your account.
Failing that head over to the Windows Live forums to get more support and help.