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Method 3: Contact Microsoft After Hardware Change In this case, you need to use a different key to activate your Windows. If the Windows 10 error 0xC004C003 appears after you manually enter the Windows 10 product key, then your key might be not valid. Method 2: Double Check If You Have Entered a Valid Product Key

Step 3: Restart your system and then check if your Windows is activated. Step 2: Type slmgr.vbs –rearm in the window and then press Enter. Step 1: Type cmd in the Search bar and then right-click Command Prompt to choose Run as administrator. Step 2: Go to the Activation tab and then click the Activate button. Step 1: Press the Win + I keys at the same time to open Settings. To activate Windows 10, follow the instructions below: Note: This method may work if you upgrade to Windows 10 from a legal copy of an earlier Windows version.