When you are trying to sign in Windows Live Messenger you are getting an Error Code 80072efd ;"Sorry, we were unable to sign you in to the .NET Messenger Service at this time. Please try again later. 80072efd"
Check the .NET Messenger Service Status.
Remove any Internet Explorer proxy server settings
In Internet Explorer, click Tools and then click Internet Options. In the Internet Options dialog box, go to the Connections tab. Click LAN Settings… Untick the Use a proxy server for your LAN (These settings will not apply to dial-up or VPN connections) checkbox.
Click OK and OK again Internet Options
Click on the Start menu, select Run and type the following:
regsvr32 Dssenh.dll Gpkcsp.dll Slbcsp.dll Sccbase.dll