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.
