Try signing in from the Zune Music + Video software instead.
In the Zune Music + Video software, go toSettings, Account.
Click Sign in.
If you can't sign in on the Zune Music + Video website but can sign in on the Zune Music + Video software, try adjusting your settings in Internet Explorer.
If you can’t sign in on either the Zune Music + Video software or the Zune Music + Video website, the service may be unavailable or you may need to check your Windows Live ID sign in info.