Win7 Error 80072EFE
I had to do a clean install of Windows 7 on an old PC for reasons I will not go into. After installing Win7 SP1 and a couple of drivers I ran Windows update but it failed almost immediately with Error / Code 80072EFE “Windows Update encountered an unknown error.”
I tried the familiar Windows update repairs with no success. After some research I downloaded Windows patch # KB3138612, ran it, reboot, and Windows update now worked as it should.
Download Update for Windows 7 for x64-based Systems (KB3138612) from Official Microsoft Download Center