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== Product Key Problems =====Changing product key from Command Prompt===Step 1: Open Command Prompt with admin rights. To do so, switch to the Start screen, type CMD and then simultaneously press Ctrl + Shift + Enter keys to run Command Prompt as administrator. You can also go through our how to run Command Prompt as administrator in Windows 8 guide for step-by-step instructions.Click Yes button when you see the UAC prompt.Step 2: In the elevated prompt, type slmgr.vbs /ipk <Your product key> and then press enter key to change the product key and activate Windows using the newly entered product key.For instance, if your product key is 12345 12345 12345 12345 12345, then you need to type slmgr.vbs /ipk 12345 12345 12345 12345 12345 followed by Enter key to activate your Windows 8/8.1.