How to Activate Windows 10 & 11 (Every Method Explained)

Windows activation confirms that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow. Whether you just installed a fresh copy or bought a new PC, activation is a one-time step that unlocks the full Windows experience.

This guide covers every activation method for both Windows 10 and Windows 11 — from entering a product key to using Command Prompt. Pick the method that matches your situation, and you’ll be activated in minutes.

Key Takeaways

• Windows can be activated using a product key, digital license, Command Prompt (slmgr), or the built-in Activation Troubleshooter.
• A product key is a 25-character code (XXXXX-XXXXX-XXXXX-XXXXX-XXXXX) that you enter in Settings or via Command Prompt.
• Unactivated Windows shows a persistent watermark and blocks personalization features like wallpaper and themes.

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How to Check if Windows Is Activated

Before trying any activation method, check your current status. It takes 10 seconds.

On Windows 11:

1. Open Settings (press Windows + I).
2. Click System in the left sidebar.
3. Scroll down and click Activation.
4. Look for “Activation state” — it shows Active or Not active.

On Windows 10:

1. Open Settings (press Windows + I).
2. Click Update & Security.
3. Click Activation in the left sidebar.
4. The status shows either “Windows is activated” or “Windows is not activated.”

If your status shows Active with a digital license linked to your Microsoft account, you’re fully set. If not, use one of the methods below.

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How to Activate Windows with a Product Key

This is the most common method. A product key is a 25-character alphanumeric code formatted as XXXXX-XXXXX-XXXXX-XXXXX-XXXXX. You receive one when you buy a genuine Windows license key.

On Windows 11

1. Open Settings → System → Activation.
2. Click Change next to “Change product key.”
3. Enter your 25-character product key.
4. Click Next, then Activate.
5. You’ll see “Windows is activated” if successful.

On Windows 10

1. Open Settings → Update & Security → Activation.
2. Click Change product key.
3. Type your 25-character key.
4. Click Next and follow the on-screen prompts.

Tip: Make sure you’re connected to the internet. Windows contacts Microsoft’s activation servers to verify the key.

Don’t have a product key yet? You can buy a Windows 10 Pro license key or Windows 11 Pro key from authorized resellers like The Software City, where genuine keys start at $49.99 with instant digital delivery.

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How to Activate Windows with a Digital License

A digital license (also called a “digital entitlement”) links your Windows activation to your Microsoft account instead of a product key. You don’t need to enter any code — activation happens automatically.

You have a digital license if:

• You upgraded to Windows 10 or 11 from an activated copy of Windows 7 or 8.1 (the free upgrade program).
• You bought Windows from the Microsoft Store.
• You linked your Microsoft account to your digital license.

How it works:

1. Sign in to your Microsoft account on the device.
2. Go to Settings → Activation.
3. Windows checks with Microsoft’s servers and activates automatically.

If you’ve replaced hardware (like a motherboard), the digital license might not match. In that case, use the Activation Troubleshooter (covered below).

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How to Activate Windows Using Command Prompt (slmgr)

The Software Licensing Management Tool (slmgr) is a built-in command-line utility for managing Windows activation. Use this method when the Settings app won’t accept your key or you need to script activation across multiple machines.

Step-by-Step Instructions

1. Open Command Prompt as Administrator:
2. Press Windows + S, type cmd.

3. Right-click Command Prompt and select Run as administrator.

4. Install the product key: slmgr /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX Replace the X’s with your actual 25-character product key. A dialog box confirms “Product key installed successfully.”

5. Activate Windows online: slmgr /ato This contacts Microsoft’s activation servers. You’ll see “Product activated successfully” if it works.

6. Verify activation: slmgr /dli This displays your license status. Look for “License Status: Licensed.”

Other Useful slmgr Commands

Command	What It Does
slmgr /dli	Shows basic license info (edition, status, partial key)
slmgr /dlv	Shows detailed license info (activation ID, expiry, grace period)
slmgr /xpr	Shows license expiration date (or “permanently activated”)
slmgr /upk	Uninstalls the current product key from this device
slmgr /cpky	Clears the product key from the registry (security measure)

When to use slmgr: This method works identically on Windows 10 and Windows 11. It’s especially useful for IT administrators managing volume licenses or troubleshooting activation errors.

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How to Activate Windows Using the Activation Troubleshooter

The Activation Troubleshooter helps when Windows loses its activation — typically after a hardware change like replacing the motherboard, CPU, or hard drive.

Requirements: Your digital license must be linked to your Microsoft account before the hardware change.

On Windows 11

1. Open Settings → System → Activation.
2. If you see “Windows is not activated,” click Troubleshoot.
3. Select “I changed hardware on this device recently.”
4. Sign in with the Microsoft account linked to your digital license.
5. Select the device from the list and check “This is the device I’m using right now.”
6. Click Activate.

On Windows 10

1. Open Settings → Update & Security → Activation.
2. Click Troubleshoot.
3. Follow the same steps as Windows 11 above.

Important: The troubleshooter only appears when Windows detects it’s not activated. If your device is already activated, you won’t see the troubleshoot option.

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How to Find Your Windows Activation Key

Lost your product key? Here are several ways to recover it.

Method 1: Check your email. If you bought a digital license from a retailer like The Software City, the key was delivered to your email. Search your inbox for “product key” or “license key.”

Method 2: Use Command Prompt.

wmic path softwarelicensingservice get OA3xOriginalProductKey

This retrieves the OEM key embedded in your UEFI/BIOS firmware. Works on laptops and pre-built PCs that came with Windows pre-installed.

Method 3: Check your Microsoft account. Go to account.microsoft.com/devices and sign in. Devices linked to your digital license appear here (though the full key isn’t displayed — just the activation status).

Method 4: Check the product packaging. If you bought a retail box copy, the product key is on a card or sticker inside.

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How to Remove the “Activate Windows” Watermark

The “Activate Windows — Go to Settings to activate Windows” watermark appears in the bottom-right corner when Windows isn’t activated. The only permanent way to remove it is to activate Windows with a genuine product key or digital license.

Once activated:

1. The watermark disappears immediately (or after a restart).
2. All personalization settings unlock (wallpaper, themes, colors, lock screen).
3. You receive full security updates and support from Microsoft.

Quick fix: If you need an affordable genuine key, Windows 10 Home starts at $49.99 at The Software City and Windows 11 Pro is $99.99 — both with instant delivery.

For a detailed cost breakdown across editions and retailers, see our guide on how much it costs to activate Windows.

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What Happens if You Don’t Activate Windows?

Windows works without activation, but with limitations. Microsoft does not lock you out entirely — you can still use core features, install programs, and browse the web.

Restrictions on unactivated Windows:

Feature	Activated	Not Activated
Desktop watermark	No watermark	Persistent “Activate Windows” watermark
Wallpaper & themes	Full access	Blocked (solid color only)
Colors & accent	Customizable	Locked
Lock screen	Customizable	Locked
Windows Updates	Full updates	Security updates only
Core functionality	Full	Full
Microsoft Store	Full	Full

Bottom line: You can use unactivated Windows indefinitely, but the watermark is a constant reminder, and personalization is locked. A genuine Windows license key removes these restrictions permanently.

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How to Activate Windows on a New Computer

Setting up a new PC? Here’s the fastest path to activation:

1. During Windows setup: When prompted, enter your product key. Windows activates automatically once connected to the internet.
2. Skip for now: Select “I don’t have a product key” during setup. You can activate later through Settings.
3. OEM pre-activated: If you bought a PC from Dell, HP, Lenovo, or similar, Windows comes pre-activated. The key is embedded in the UEFI firmware and activates automatically.
4. Transfer a license: If you have a retail license from your old PC, deactivate it first (slmgr /upk in Command Prompt), then enter the same key on the new PC.

Note: OEM licenses (the kind that come with pre-built PCs) are tied to the original motherboard and cannot be transferred. Only retail licenses are transferable. Learn more about the difference in our Windows 11 Home vs Pro buying guide.

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Activation Methods Compared

Method	Best For	Requires Internet	Difficulty
Product key via Settings	Most users	Yes	Easy
Digital license	Upgraders, Microsoft Store buyers	Yes	Automatic
Command Prompt (slmgr)	IT admins, troubleshooting	Yes	Intermediate
Activation Troubleshooter	After hardware changes	Yes	Easy
OEM (BIOS-embedded)	New pre-built PCs / laptops	Yes (first boot)	Automatic

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Frequently Asked Questions

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