For users experiencing difficulties activating Windows online—such as after significant hardware changes or when internet connectivity is problematic—phone activation is an alternative method. From the activation settings, select the option labeled “I want to activate by phone,” choose your country or region to receive the appropriate phone number, and then call Microsoft Support to complete the activation process.
Download Activator Windows 8.1 Pro Build 9600 64-Bit: A Complete Guide Download Activator Windows 8.1 Pro Build 9600 64 Bit
Type slmgr.vbs /ipk YOUR-PRODUCT-KEY-HERE and press (replace with your actual key). Download Activator Windows 8.1 Pro Build 9600 64 Bit