Step 1 : Download PC Repair & Optimizer Tool (Windows 10, 8, 7, XP, Vista – Microsoft Gold Certified).The program fixes common errors that might occur on Windows systems with ease - no need for hours of troubleshooting when you have the perfect solution at your fingertips: Additionally it is a great way to optimize your computer for maximum performance. You can now prevent PC problems by using this tool, such as protecting you against file loss and malware.

Then press the “Enter” key on the keyboard.Īs soon as you press the Enter key, a “Phone Activation” window appears in front of you. Type the command: “SLUI 4” in the Run window. You can also open Windows from the Start menu of the Windows 8.1 or Windows 10 system. Press and hold the Windows key and the R key to open the Run window. How to Fix Windows 10 Activation Error Code 0xC004C008: Solution 1 There are a few simple solutions to this problem, and most of them should be easy to implement on their own. This happens because the key has already been used on this or another computer to install operating systems. Because the Windows 10 or Windows 8.1 license can only be installed on one device, and of course, if your device fails and you buy a new device or simply modify a hardware component, you may need a new product activation code.īasically, when you reinstall the Windows operating system you previously purchased and installed on another computer, an error code appears with a message indicating that the activation server has determined that the specific key could not be used to activate. The error code 0xc004c008 usually appears when you install the Windows 8.1 or Windows 10 product a number of times. Update: Stop getting error messages and slow down your system with our optimization tool. Perform Windows activation Troubleshooter.

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