Activate Windows 7 or Windows 8.1
Note: For info about how to activate Windows 10, see Activation in Windows 10.
Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow.
A Windows product key is a 25-character code used to activate Windows 7 or Windows 8.1. It looks like this:
PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Without a product key, you won’t be able to activate your device.
Your product key should be in the confirmation email you received after buying Windows, included with the packaging that came with your PC, or on the Certificate of Authenticity (COA) attached to the back or bottom of your PC.
For more info about Windows product keys and where to find them for the copy of Windows that’s on your PC, see Find your Windows product key.
If you have a volume license and want to activate Windows by phone, go to Microsoft Volume Licensing Activation Centers Worldwide Telephone Numbers.
If you need to install and activate Microsoft Office, go to Download and install or reinstall Office on your PC or Mac.
Support for Windows 7 ended on January 14, 2020
We recommend you move to a Windows 10 PC to continue to receive security updates from Microsoft.
When you begin activation, Windows will try to use your internet connection to activate online. If you have problems activating online or don’t have an internet connection, you can activate by phone.
To activate Windows 7 using an internet connection:
Select the Start button 
, right-click Computer, select Properties, and then select Activate Windows now.
If Windows detects an internet connection, select Activate Windows online now. 
You might be asked for an admin password or to confirm your choice.
Enter your Windows 7 product key when prompted, select Next, and then follow the instructions.
To activate Windows 7 by phone:
Select the Start button , right-click Computer, select Properties, and then select Activate Windows now.
Choose Show me other ways to activate.
Enter your Windows 7 product key, and then select Next.
Select Use the automated phone system. You may be asked for an admin password or to confirm your choice.
Select your location (or the location nearest to you) from the drop-down list, and then select Next.
Call one of the available phone numbers listed. An automated system will guide you through the activation process.
When you begin activation, Windows will try to use your internet connection to activate online. If you have problems activating online or don’t have an internet connection, you can activate by phone.
To activate Windows 8.1 using an internet connection:
Select the Start button , type PC settings, and then select PC settings from the list of results.
Choose Activate Windows.
Enter your Windows 8.1 product key, select Next, and follow the instructions.
To activate Windows 8.1 by phone:
Select the Start button , enter PC settings, and then select PC settings from the list of results.
Select Activate Windows, and then select Contact customer support for help. You may be asked for an admin password or to confirm your choice.
Select your location (or the location nearest to you) from the drop-down list, and then select Next.
Call one of the available phone numbers listed. An automated system will guide you through the activation process.
Activate Windows 10
Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow.
Checking your activation status
You’ll first want to find out if your Windows 10 is activated and linked to your Microsoft account.
It is essential that you link your Microsoft account to the Windows 10 license on your device. Linking your Microsoft account with your digital license enables you to reactivate Windows using the Activation troubleshooter whenever you make a significant hardware change.
To check activation status in Windows 10, select the Start button, and then select Settings > Update & Security and then select Activation . Your activation status will be listed next to Activation.
You’ll see one of these activation status messages on the Activation page:
Windows is activated
You are activated.
Microsoft account is not linked.
Windows is activated with a digital license
You are activated.
Your Microsoft account is not linked to your digital license.
Windows is activated with a digital license linked to your Microsoft account
You are activated.
Your Microsoft account is already linked to your digital license.
Windows is not activated
You are not activated.
You will see an error message explaining the failure.
You might need to purchase Windows 10 to activate.
If you need to purchase a license for your device, see «Purchase a Windows 10 license.»
If you have purchased a license for this device already and still receive an error message, continue to Methods of activation.
To link your Microsoft account, follow these instructions:
Sign in as an administrator to add your Microsoft account. To confirm you’re using an administrator account, select the Start button, then select Settings > Accounts > Your info . Under your name, you’ll see Administrator. If you’re not an administrator, see Create a local user or administrator account.
Confirm that the administrator account is also your Microsoft account by checking to see if an email address is displayed above Administrator. If an email address is displayed, this is a Microsoft account. If not, you’re logged in with a local account. If you don’t yet have a Microsoft account, see How to create a new Microsoft account.
Once you confirm that you’re an administrator and using your Microsoft account, go back to the Activation page, select Add an account, enter your Microsoft account and password, and then select Sign in.
After your Microsoft account has been added, on the Activation page you’ll see Windows is activated with a digital license linked to your Microsoft account.
Methods of activation
Depending on how you got your copy of Windows 10, you’ll need either a digital license or a 25-character product key to activate it. Without one of these, you won’t be able to activate your device.
A digital license (called a digital entitlement in Windows 10, Version 1511) is a method of activation in Windows 10 that doesn’t require you to enter a product key.
A product key is a 25-character code used to activate Windows. What you’ll see is PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX.
After determining which activation method you use, follow the steps in the corresponding Activate using a digital license or Activate using a product key.
Your activation method depends on how you got your copy of Windows 10.
If you got Windows 10 by.
Upgrading to Windows 10 for free from an eligible device running a genuine copy of Windows 7 or Windows 8.1
If you associated or signed onto a Microsoft Account or associated your MSA with your digital license, that will be your MSA containing the digital license.
Buying a Windows 10 Pro upgrade from the Microsoft Store app and successfully activated Windows 10
When purchasing from Microsoft Store, a confirmation email was sent to confirm the purchase. That email address (MSA) will contain the digital license.
Being a Windows Insider and upgrading to the newest Windows 10 Insider Preview build on an eligible device that was running an activated earlier version of Windows and Windows 10 Preview
The email address that you used for your Windows Insider login will likely be the MSA containing your digital license.
Buying genuine Windows 10 from the Microsoft Store app
When purchasing from Microsoft Store, a confirmation email was sent to confirm the purchase. That email address (MSA) will contain the digital license.
Buying a PC that came with Windows 10
Find your product key either on the device packaging or on the Certificate of Authenticity (COA) attached to your device.
Buying a box copy of Windows 10 from an authorized retailer
Find your product key on a label inside the Windows 10 box.
Buying a digital copy of Windows 10 from an authorized retailer
Find your product key in the confirmation email you received after buying Windows 10 or in a digital locker accessible through the retailer’s website.
A digital license will be given to your device for Windows 10 based on the valid product key you entered.
Having a Volume Licensing agreement for Windows 10 or MSDN subscription
Your product key is available through the web portal for your program.
Buying a new or refurbished device running Windows 10
Your product key is preinstalled on your device, included with the device packaging, or included as a card or on the Certificate of Authenticity (COA) attached to the device.
If you bought a refurbished PC, the refurbisher, not Microsoft, must provide you a product key.
Buying from the Microsoft Store online
Find your product key in the confirmation email that contains the order history.
If you don’t have a digital license or a product key, you can purchase a Windows 10 digital license after installation finishes. Here’s how:
Select the Start button.
Select Settings > Update & Security > Activation .
Select Go to Store.
This opens the Microsoft Store app where you can purchase a Windows 10 digital license.
Activate using a digital license
Digital licenses are associated with your hardware and linked to your Microsoft account, so there’s nothing you need to find on your PC. You’re all set once your PC is connected to the internet and you log in to your Microsoft account.
If you are using a digital license linked to a Microsoft account, you can run setup and skip the product key option by selecting I don’t have a product key. When you sign in with your Microsoft account and connect to the internet, you will be activated.
If you have a digital license for your device, you can reinstall the same edition of Windows 10 on this device without entering a product key.
Make sure that Windows 10 is activated before you try to reinstall it. To find out, select the Start button, and then select Settings > Update & Security > Activation . You’ll be able to confirm that your Windows 10 has been activated and that your Microsoft account is associated with your digital license.
Here are the possible messages that display on the Activation page:
Windows is activated with a digital license
Your Microsoft account is not linked to your digital license. Follow instructions for Linking your Microsoft account.
Windows is activated with a digital license linked to your Microsoft account
Your Microsoft account is already linked to your digital license.
If Windows 10 isn’t activated on your device, see Get help with Windows 10 activation errors for more info.
If your digital license is not linked to your Microsoft account, follow the steps under Checking your Activation status, Linking your Microsoft account.
Once you have your account linked, then you can run setup to reinstall Windows 10. For more info about how to create installation media to reinstall Windows 10, go to the Microsoft software download website. When creating installation media, make sure to choose the edition of Windows 10 that matches the edition already installed on your device.
During reinstallation, if you’re asked to enter a product key, you can skip this step by selecting I don’t have a product key. Windows 10 will automatically activate online after the installation is complete. If you linked your digital license with your Microsoft account, be sure to sign in to the Microsoft account that is linked to the digital license.
When you make a significant hardware change to your device, such as replacing the motherboard, Windows 10 might no longer be activated.
Make sure you associate your Microsoft account to your digital license to prepare for hardware changes. The association enables you to reactivate Windows using the Activation troubleshooter if you make a significant hardware change later. For more info, see Reactivating Windows 10 after a hardware change.
If you don’t have a digital license, you’ll use a product key to activate.
Activate using a product key
A product key is a 25-character code, that looks like this:
PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
During installation, you’ll be prompted to enter a product key. Or, after installation, to enter the product key, select the Start button, and then select Settings > Update & Security > Activation > Update product key > Change product key.
To locate your product key, see the product key table in Activation methods, What activation method do I use, a digital license or a product key?
Note: Microsoft only keeps a record of product keys if you purchased from the Microsoft online store. You can find out if you purchased from Microsoft in your Microsoft account Order history. For more help, see Find your Windows product key.
If you have a product key, then you can use Change product key to activate Windows 10 in each of the following scenarios. Below is supplemental information that might help you with activation:
You’ll need to use a valid product key to activate Windows 10 on a device that has never had an activated copy of Windows 10 on it.
You’ll also need to use a valid product key if you’re installing an edition of Windows 10 that wasn’t previously activated on the device. For example, you’ll need a valid product key to install and activate Windows 10 Pro on a device that had Windows 10 Home installed.
During the installation, you’ll be asked to enter a valid product key. After the installation is complete, Windows 10 will automatically be activated online. To check activation status in Windows 10, select the Start button, and then select Settings > Update & Security > Activation .
If Windows 10 isn’t activated on your device, see Get help with Windows 10 activation errors for more info.
Note: In some cases, you might need to enter the Windows 10 product key that either came with the device packaging, was included as a card, or that appears on the Certificate of Authenticity (COA) attached to the device. If you don’t have a Windows 10 product key, you’ll have the option to buy one during installation.
When you buy a refurbished device running Windows 10, you’ll need to activate Windows using the product key on the Certificate of Authenticity (COA) that’s attached to your device.
If your original hardware manufacturer (OEM) changed the motherboard for you, your PC should reactivate automatically. If it doesn’t activate, your OEM might have provided a COA card with a 25-character key under a gray scratch cover. Follow these steps to get activated.:
Note: To remove the gray coating that conceals the product key, gently scratch it off using a coin or your fingernail.
Select the Start button, and then select Settings > Update & Security > Activation .
Select Change product key.
Type in the product key found on the COA and follow the instructions.
During reinstallation, you’ll be asked to enter a product key. When you type in your product key, you will have an activated edition of Windows 10.
If you finished setup and did not enter your product key, you can still enter your product key. Select the Start button, and then select Activation > Update product key > Change product key.
When you make a significant hardware change to your device, such as replacing the motherboard, Windows 10 might no longer be activated.
If you do not reinstall Windows, then you can select the Start button, and then select Activation > Update product key > Change product key to reactivate your device. Otherwise you can enter your product key during installation of Windows.
If your original hardware manufacturer (OEM) changed the motherboard for you, your PC should reactivate automatically. If it doesn’t activate, your OEM might have provided a COA card that has a gray coating over a 25-character key. Follow these steps to get activated.
Note: To remove the gray coating that conceals the product key, gently scratch it off using a coin or your fingernail.
Select the Start button, and then select Settings > Update & Security > Activation .
Select Change product key.
Type in the product key found on the COA and follow the instructions.
