Sometimes your Windows doesn’t work properly to complete the technical works you are going through. You go with many fixes to make the computer stable but nothing works. In these situations, you reinstall the Windows or you simply upgrade or install newer version of Windows in the computer. Sometimes when you install Windows 7 in the system and try to activate it, you will see Windows activation error 0x80072f78 on the computer screen and Windows won’t be activated. If you are facing this issue, then you are at the right place to resolve the problem. You can go with the manual or automatic methods recommended here. For automatic fixing, you can use Advanced System Repair tool in the computer.