Fixes / Windows · Checked September 30, 2026

Windows "Activate Windows" watermark: what it means and how to fix it

Short answer

The "Activate Windows" watermark means Windows cannot confirm this PC has a valid license. Common reasons are a new or reinstalled system, a hardware change, or the wrong edition. Open Settings > System > Activation (Windows 11) or Settings > Update & Security > Activation (Windows 10). Select Troubleshoot, or Change product key and enter your 25-character key.

What this message means

Windows shows this text in the bottom-right corner of the screen when its activation check fails, meaning it cannot confirm that the copy on this PC has a valid license. The PC keeps working. You can still browse, install apps and get security updates. Personalization settings such as wallpaper, colors and themes are locked, and the watermark stays on screen until activation succeeds. It is not a virus or a display bug. It comes from Windows' own licensing system, and the Activation page in Settings shows the exact reason, usually with an error code such as 0xC004F213 or 0x803F7001.

Common causes

Cause	How to tell
Windows was installed or reinstalled without a product key, or the key was never entered	On the Activation page, Activation state shows "Not active". If you look up the error code, it is often 0x803F7001 (no valid license found). This is common on self-built PCs and on fresh installs where you chose "I don't have a product key".
A major hardware change, usually a new motherboard, broke the link between the digital license and the PC	The watermark appeared right after a repair or upgrade. The Activation page reports that the hardware has changed (error 0xC004F211 or 0xC004F213).
The installed edition does not match the license (for example Windows Pro installed on a PC licensed for Home)	The Activation page lists an edition, such as Pro, that differs from the one printed on your key or sold with the PC. The error is 0xC004F212 (key not compatible with this edition).
A work or school PC cannot reach the organization's activation server (KMS)	The PC belongs to an employer or school, and the watermark appears after it has been off the office network or VPN for a long time. The error is 0xC004F074 or 0xC004F050, or the troubleshooter says it cannot reach the activation server.
The product key was already used on another PC, or it was a cheap or unofficial key that Microsoft has since blocked	Windows was activated before and then stopped, often weeks after you bought a low-priced key online. The Activation page shows 0xC004C003 or says the key has been blocked or used on another device.

How to fix it

1. Check the activation status and run the Activation troubleshooter

Windows 11: Settings > System > Activation. Windows 10: Settings > Update & Security > Activation

Make sure the PC is connected to the internet and you are signed in with an administrator account.
Open Start > Settings. On Windows 11 go to System > Activation. On Windows 10 go to Update & Security > Activation.
Read the Activation state line and write down any error code shown.
Select Troubleshoot. The option only appears when Windows is not activated.
Follow the prompts. If the troubleshooter finds a digital license for this PC, it reactivates Windows automatically.
Restart the PC. The watermark can stay on screen until the next restart or sign-in, even after activation succeeds.

2. Enter your 25-character product key

Windows 10 and 11. Use this if you have a retail key, a key from the box or email, or a key from a licensed seller

Find your key. It may be in a purchase confirmation email, on a card in the box, or in your Microsoft account order history.
On a PC that came with Windows preinstalled, the key is often stored in the firmware. To display it, open PowerShell and run: (Get-CimInstance -ClassName SoftwareLicensingService).OA3xOriginalProductKey
Go to Settings > System > Activation (Windows 11) or Settings > Update & Security > Activation (Windows 10).
Select Change product key, type the 25-character key, and select Next, then Activate.
If the key is rejected with an edition error (0xC004F212), the key is for a different edition. Continue with the edition fix below.

3. Reactivate after a hardware change with your Microsoft account

Windows 10 and 11. Works only if the digital license was linked to a Microsoft account before the hardware change

Go to Settings > System > Activation (Windows 11) or Settings > Update & Security > Activation (Windows 10).
Select Troubleshoot, then select I changed hardware on this device recently.
Sign in with the Microsoft account that is linked to the license.
In the list of your devices, find this PC and select the checkbox next to This is the device I'm using right now.
Select Activate. If this PC is not listed, the license was not linked to that account, or the edition has changed. You will need a product key.

4. Switch to the edition your license covers

Most common when Pro was installed on a PC that shipped with Home, or the other way around

On the Activation page, check which edition is installed, then check which edition your key or PC was sold with.
If you have a Home license but Pro is installed, back up your files, then reinstall Windows with the Media Creation Tool from microsoft.com/software-download. Choose the Home edition when asked. PCs with a key stored in firmware usually pick the correct edition automatically.
If you have a Pro key and Home is installed, select Change product key and enter the Pro key. Windows upgrades itself to Pro without a reinstall.
After Windows restarts, check the Activation page again. It should show Active.

5. Reconnect a work or school PC to the organization's network

Windows 10 and 11 Pro, Enterprise and Education devices managed by an organization

Connect to the office network or sign in to the company VPN.
Open Command Prompt as administrator and run: slmgr /ato to force an activation attempt.
Run slmgr /dlv to see the license details and the activation server being used.
If it still fails with 0xC004F074 or 0xC004F050, contact your IT department. The activation server or the volume license is theirs to fix, not yours.

6. Buy a genuine license

When there is no valid key, or the existing key has been blocked or used on another PC

Go to Settings > System > Activation (Windows 11) or Settings > Update & Security > Activation (Windows 10).
Select Go to Store (on some Windows 11 versions this is the Microsoft Store app button next to Get a new license).
Buy the edition that matches what is installed, Home or Pro, so you do not need to reinstall.
Windows activates automatically after the purchase. Restart to clear the watermark.

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Still not fixed?

If the troubleshooter and a valid key both fail, write down the exact error code from the Activation page and contact Microsoft Support through the Get Help app (type "Get Help" in Start). An agent can activate a legitimately licensed PC by phone or remote session. If Windows came preinstalled and the watermark appeared after a repair, ask the PC maker or repair shop, because a replaced motherboard may need its original key restored. On a work or school computer, go straight to your IT department. Avoid "activator" tools and registry tweaks sold as watermark removers. They do not license Windows and often carry malware.

Questions people ask

Can I keep using Windows without activating it?

Yes. Unactivated Windows keeps working and still gets security updates. The watermark stays on screen and personalization settings such as wallpaper, colors and themes are locked. Microsoft's license terms still require a valid license.

Why did the watermark appear when Windows was already activated?

Usually because Windows could no longer validate the license. Common triggers are a hardware change, a blocked or reused key, or a work PC that has been off the company network too long. The error code on the Activation page tells you which one applies.

Does changing the PaintDesktopVersion registry value remove the watermark?

Sometimes it hides the text for a while, but it does not activate Windows. Personalization stays locked and the watermark often comes back after an update or restart. Activating with a valid license is the only permanent fix.

Do I need to buy a new key after replacing my motherboard?

Not always. If your digital license was linked to a Microsoft account, use Troubleshoot > I changed hardware on this device recently to move it. Licenses that came preinstalled on a branded PC (OEM licenses) are generally tied to the original motherboard, so a replacement may need a new license or help from the PC maker.

Will reinstalling Windows remove the Activate Windows message?

Only if you reinstall the edition your PC is licensed for. A PC with an existing digital license reactivates automatically after going online. Reinstalling the same unlicensed edition brings the watermark back.

Sources

Related errors