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After you’ve installed Windows 10 without a key, it won’t actually be activated. However, an unactivated version of Windows 10 doesn’t have many restrictions. With Windows XP, Microsoft actually used Windows Genuine Advantage (WGA) to disable access to your computer.Does Windows 10 automatically activate?
After you successfully activate Windows 10 for the first time, that device will activate automatically in the future, with no product key required. That's a huge change from previous versions of Windows, which required a product key for every installation.Why is my Windows 10 not activated?
Top reasons Windows 10 fails activate: Not connected to the Internet. Antivirus or Firewall utilities might be blocking product activation. Your computer is behind a proxy server, disabling the proxy temporarily or using chat support can resolve this. Your computer did not upgrade from a genuine version.