If a watermark says “Activate Windows” in the corner of your screen, Windows does not recognise a valid licence. Here is how to fix it properly.
Step 1: check your status
Go to Settings → System → Activation. It shows whether Windows is activated and whether you have a digital licence or product key.
Step 2: activate
If your laptop came with Windows
Most new laptops have a digital licence linked to the hardware and activate automatically when online. If not, connect to the internet and use the Troubleshoot option on the Activation page.
If you have a product key
On the Activation page, choose Change product key and enter the 25-character key from your purchase.
If you changed hardware
Sign in with the Microsoft account linked to your licence and use the activation troubleshooter to reactivate.
Buying a licence
Buy Windows from the Microsoft Store, Microsoft’s website or an authorised retailer. Be very wary of extremely cheap keys from unknown websites: they may be stolen or stop working.
Still on Windows 10?
Microsoft ended Windows 10 support on 14 October 2025. If your PC is eligible, upgrade to Windows 11 for continued security updates. See free antivirus for Windows.
This guide was checked in October 2026. Menus and services change, so if something looks different on your phone, check with your provider.
Common questions
How do I check if Windows is activated?
Go to Settings → System → Activation. It shows whether Windows is active and how.
Can I use Windows without activating?
Windows works with some limits, such as a watermark and restricted personalisation. You should activate a genuine copy.
Are free activators safe?
No. KMS activators and cracks are illegal and often carry malware.
My laptop came with Windows. Is it already activated?
Usually yes, with a digital licence linked to the hardware. Check Settings → System → Activation.
