How to Plug in Your Product Key with SLMGR and SLUI

What SLMGR and SLUI Do

Windows activation tools

Tool	Interface	Main Purpose
SLMGR	Command Prompt or Windows Terminal.	Installs keys, requests activation, and displays licensing information.
SLUI 3	Graphical product-key window.	Allows the user to enter or change a Windows product key.
SLUI 4	Graphical phone-activation workflow where available.	Provides regional phone-activation instructions on supported systems.
Activation Settings	Windows Settings.	Displays the edition, activation status, troubleshooting options, and product-key controls.

Installing a product key and activating Windows are separate operations. The key may install successfully while online activation still returns an error.

Before Installing a Product Key

Check the Installed Windows Edition

The product key must match the Windows edition installed on the computer.

1. Press Windows + R.
2. Enter winver.
3. Select OK.
4. Record the displayed Windows edition.

You can also open Settings > System > About and check the edition under Windows specifications.

A Windows Home key cannot activate Pro, and a Pro key cannot normally activate Enterprise or Education. If the editions do not match, follow a supported edition-upgrade path first.

Check the Current Activation Status

1. Open Settings.
2. Select Update & Security on Windows 10.
3. Select Activation.
4. Record the current edition, activation state, and any displayed error code.

On Windows 11, the Activation page is located under Settings > System > Activation.

Product Key Requirements

• The key must contain 25 characters.
• The key must match the installed Windows edition.
• The key must be valid for the applicable Windows release and licensing channel.
• The key must not be blocked or used on more devices than its license permits.
• The computer should have the correct date, time, and time zone.
• An internet connection is normally required for online activation.

A product key normally follows this format:

XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

Never use a genuine product key in a public tutorial, screenshot, log file, or support forum.

Install a Product Key with SLMGR

Open Command Prompt as Administrator

1. Open the Windows search box.
2. Search for Command Prompt.
3. Right-click the result.
4. Select Run as administrator.
5. Select Yes when User Account Control appears.

You can also press Windows + R, enter cmd, and press Ctrl + Shift + Enter.

Install the Product Key

Run the following command, replacing the placeholder with the genuine product key:

slmgr.vbs /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

The /ipk parameter installs the supplied key. A Windows Script Host dialog should report whether the key was installed successfully.

A successful installation message does not necessarily mean that Windows has been activated. It only confirms that Windows accepted the key for installation.

Request Online Activation

After installing the key, run:

slmgr.vbs /ato

The /ato parameter instructs Windows to request activation using the currently installed product key.

Keep the computer connected to the internet and wait for the Windows Script Host dialog. If activation fails, record the complete error code before closing it.

Change a Product Key with SLUI

SLUI provides a graphical alternative for users who prefer not to enter a product key in Command Prompt.

Use SLUI 3

1. Press Windows + R.
2. Enter slui 3.
3. Select OK.
4. Enter the new 25-character product key.
5. Select Next.
6. Follow the displayed activation instructions.

The appearance of the dialog may vary according to the Windows version and edition.

Use Windows Activation Settings

You can also change the product key without using Run or Command Prompt.

1. Open Settings.
2. On Windows 10, select Update & Security > Activation.
3. On Windows 11, select System > Activation.
4. Select Change product key.
5. Enter the genuine product key.
6. Select Next.
7. Complete the activation process.

Use SLUI 4 for Phone Activation

Some Windows versions and licensing scenarios may provide a phone-activation workflow through SLUI 4. Availability varies by Windows edition, region, and license type.

1. Press Windows + R.
2. Enter slui 4.
3. Select OK.
4. Select the correct country or region if the window appears.
5. Use only the official phone number displayed by Windows or published by Microsoft.
6. Follow the official activation instructions.

If SLUI 4 does not open or does not provide a phone number, use the Activation troubleshooter or contact Microsoft through an official support channel. Do not call numbers found in unverified pop-ups or third-party support pages.

Verify Windows Activation

Check Activation Settings

1. Open the Windows Activation page.
2. Confirm that the displayed edition matches your license.
3. Confirm that Windows reports it is activated.

Check the System Information

Open File Explorer and review the system information where available.

1. Open File Explorer.
2. Right-click This PC.
3. Select Properties.
4. Review the installed Windows edition.
5. Open the Activation page to confirm the current activation status.

On newer Windows versions, the Properties option opens the About page. Activation status may appear on a separate Activation page.

Verify with SLMGR

Run the following command to check whether the activation is permanent or has an expiration date:

slmgr.vbs /xpr

For detailed license information, run:

slmgr.vbs /dlv

Useful SLMGR Commands

Common SLMGR licensing commands

Command	Purpose	Administrator Access
slmgr.vbs /ipk PRODUCT-KEY	Installs a new Windows product key.	Required.
slmgr.vbs /ato	Requests online activation using the installed key.	Required.
slmgr.vbs /dli	Displays basic license and activation information.	May not be required for basic information.
slmgr.vbs /dlv	Displays detailed license information for troubleshooting.	Recommended.
slmgr.vbs /xpr	Displays whether activation has an expiration date.	May not be required.

SLMGR displays licensing information in Windows Script Host dialog boxes rather than directly inside Command Prompt.

Fix Common Activation Errors

Common SLMGR and SLUI problems

Problem	What to Verify	Next Action
Edition mismatch	Check whether Home, Pro, Enterprise, Education, or another edition is installed.	Use a valid key for the installed edition or follow a supported edition-upgrade path.
Invalid product key	Check all 25 characters and confirm the Windows product and edition.	Enter the correct key and record the complete error if it is rejected.
Blocked product key	Check the key source and activation error.	Contact the seller or Microsoft with the purchase information and error code.
Connectivity problem	Check internet access, date, time, time zone, proxy, and VPN settings.	Correct the connection or time settings and retry slmgr.vbs /ato.
Activation service unavailable	Check whether Windows reports a temporary activation-service error.	Wait and retry instead of repeatedly replacing the product key.
Key used on another device	Review the license type and number of permitted devices.	Remove the license from the previous device when permitted or obtain another license.

Run the Activation Troubleshooter

1. Open the Windows Activation page.
2. Select Troubleshoot, if available.
3. Follow the displayed instructions.
4. Record any complete activation error code.

Do not repeatedly install different keys without understanding the error. This can make the licensing state more difficult to diagnose.

Activation After a Hardware Change

A significant hardware change, especially replacing the motherboard, may cause Windows to require reactivation.

1. Confirm that the installed Windows edition has not changed.
2. Sign in with the Microsoft account previously linked to the digital license, if applicable.
3. Open the Activation troubleshooter.
4. Select the option indicating that hardware was recently changed, if displayed.
5. Select the correct device from the account list.
6. Follow the activation instructions.

OEM licenses are generally tied to the first computer on which they are activated, especially its motherboard. Retail licenses may have different transfer rights under their applicable terms.

Protect Your Product Key

• Do not publish the complete key in screenshots.
• Do not send the key through public chat rooms or forums.
• Store the purchase invoice and key in a secure location.
• Do not run activation scripts downloaded from unverified websites.
• Do not install unknown KMS tools or activation cracks.
• Use official Microsoft interfaces and built-in Windows commands.
• Contact the seller if a newly purchased key is already blocked or used.

SLMGR and SLUI are administration tools. They do not bypass Microsoft licensing requirements.

Frequently Asked Questions

Conclusion

To install and activate a genuine Windows product key from Command Prompt, run slmgr.vbs /ipk with the key and then run slmgr.vbs /ato. Use slmgr.vbs /xpr or the Windows Activation page to verify the result.

Users who prefer a graphical interface can use slui 3 or the Change product key option in Windows Settings. Phone activation through slui 4 may be available depending on the Windows version, region, edition, and license.

Always verify that the key matches the installed Windows edition, record complete activation errors, and avoid unverified activation scripts or tools.