I bought my laptop, it seemed fine — Windows worked, I installed my programs, and everything was good. It wasn’t until I tried to change my lock screen that I noticed the settings were grayed out. Then I saw the small watermark in the corner: Activate Windows. I had no idea what to do. I searched online and kms activator helped me, where they explained why this happens and how to fix it. After following their steps, I finally had full access to my system again.