Windows Update error 80072efd
If you receive Windows Update error 80072efd while checking for updates, the cause might be a high number of update requests on the Windows Update servers. Close Windows Update, wait 10 to 15 minutes, and then run Windows Update again. You can also wait for Windows Update to run at its next scheduled time.
If you continue to receive this error, it might mean that a program running on your computer is preventing Windows Update Services (SVCHOST) from accessing the Internet. Programs that might do this include firewalls, anti-spyware software, web accelerators, Internet security or antivirus programs, and proxy servers.
To correct the problem, you might need to add the Windows Update website addresses to the blocking program's exceptions or "allow" list or allow Windows Update Service to connect to the Internet through port 80 and port 443.
To add the Windows Update websites to a firewall exceptions list
If you continue to see this error, see this automatic troubleshooter
on the Microsoft Support website, or go to the Microsoft Answers
website for more assistance.
Error codes this applies to: