How to Transfer a Windows 11 or 10 License to a New PC or Motherboard

Building a new gaming desktop or upgrading your motherboard is exciting, but what happens to your existing Windows license? If you own a genuine Retail copy of Windows 10 or Windows 11, Microsoft permits you to transfer that license to your new machine without paying for a new operating system.

Step 1: Verify Your License Transfer Eligibility

Before beginning, confirm that your current key is a Retail license rather than an OEM copy:

1. Open Command Prompt as Administrator.
2. Run slmgr.vbs /dli.
3. Check the Description line. If it says RETAIL channel, you are 100% eligible for transfer. If it says OEM channel, the license is legally locked to your original motherboard.

Step 2: Uninstall the Product Key from the Old Computer

To avoid activation conflicts on Microsoft's validation servers, remove the license key from your old PC:

1. On the old computer, open Command Prompt as Administrator.
2. Deactivate and uninstall the key by typing:

   slmgr.vbs /upk

3. Clear the product key from the Windows registry cache:

   slmgr.vbs /cpky

4. Your old PC will revert to an unactivated state.

Step 3: Activate Your New PC with Your Existing Key

1. Boot into your new PC with Windows 11 installed.
2. Open Settings > System > Activation.
3. Click Change product key and enter your original 25-digit key.
4. Click Next and then Activate.

Troubleshooting: "Unable to Activate Windows (Error 0xC004C008)"

If Microsoft's automated system flags the key because it was recently active on other hardware, don't panic. Simply trigger the automated telephone verification:

1. Press Win + R, type slui 4, and press Enter.
2. Select your country and generate an Installation ID.
3. Use the WindowsKey Confirmation ID Tool or dial Microsoft's automated phone number.
4. When asked how many computers the key is installed on, answer "1".
5. Enter the 8-block Confirmation ID to complete permanent activation.