Hi after I applied SppExtComObj Injector (and KMS server & service made by "Ratiborous") to activate windows 8.1 x64, Windows update always encounters error code 80072efd. Although, after that, I activated again my windows, permanently, via Skype; but the error still exists. I think it seems to be something with the line below. Code: slmgr /skms 8.4.8.4 I ran into "Win troubleshooter" and used even this tool, but it couldn't resolve the issue: Code: hffp://go.microsoft.com/?linkid=9830262 substitute ff with tt an screenshot: Code: hffp://s7.directupload.net/images/131213/yly8kt9h.jpg Would you please help me in this regard ? Thanks