If you’ve upgraded your computer or replaced faulty hardware, you may want to move your existing Windows licence across rather than buying a new one. The good news is that some Windows licences can be transferred, but not all—so the first step is understanding which type you have and what’s allowed.
This clear, step-by-step guide explains how to check your licence type, remove it from your old PC, activate it on your new one, and avoid common activation errors.
Can You Transfer Your Windows Licence?
Whether you can move Windows to another device depends entirely on your licence type.
Retail Licence — Transfer Allowed
A Retail Windows licence is the most flexible. You can uninstall it from one computer and activate it on another, as long as it’s only in use on one device at a time.
Retail keys are usually:
- Purchased separately (not preinstalled)
- Sent by email or supplied as digital activation
- Entered manually during or after installation
If you own a Retail key, you can safely transfer it to your new PC.
OEM Licence — Not Transferable
An OEM licence (Original Equipment Manufacturer) is tied to the first PC it was activated on—specifically, the motherboard. These come preinstalled on most laptops and branded desktops.
OEM licences cannot usually be moved to a new machine unless the original motherboard has been replaced due to failure.
Typical OEM scenario:
Windows 11 Home Product Key preinstalled on a laptop
Digital Entitlement (Microsoft Account Linked)
If your PC was activated without entering a key, you may have digital entitlement. This means:
- Your licence is stored by Microsoft
- Activation happens automatically when you sign in
- Transfer is only possible if the original licence was Retail
If the entitlement originated from an OEM licence, it still cannot be transferred.
How to Transfer Windows to a New PC
Follow these steps in order. If your licence is Retail, this is all you need.
Step 1 — Remove the Licence from Your Old PC
This prevents activation conflicts.
- Open Command Prompt as Administrator
- Enter:
slmgr /upk
This uninstalls the product key.
- Then run:
slmgr /cpky
This clears the key from the registry.
Note: If your licence is linked to your Microsoft account as a digital entitlement, removal is optional but recommended.
Step 2 — Install Windows on Your New PC
Install Windows normally using a USB installer or recovery media.
When prompted for a key:
- select “I don’t have a product key”
- continue the installation
- Windows will activate later
If you need installation guidance, see your existing USB installation article once live.
Step 3 — Activate Windows on the New PC
Once Windows has finished installing, you can enter your product key.
Method A — Using Command Prompt
- Open Command Prompt (Admin)
- Enter the following:
slmgr /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
- Then activate:
slmgr /ato
Method B — Through Settings
- Open Settings
- Go to System → Activation
- Select Change product key
- Enter your key
- Restart if prompted
If upgrading during transfer, you can activate using:
You can also use a Home key if installing Home edition:
If Automatic Activation Fails
Don’t panic—this is common when Microsoft detects a hardware change.
Here are the typical causes and fixes.
Error 0xC004C008 — Product Key Already in Use
This happens when Microsoft thinks your key is still activated elsewhere.
Fix:
- Ensure you removed the key from the old PC
- Restart the new PC
- Run:
slui 4
- Select your region
- Follow the automated phone activation steps
Windows Doesn’t Recognise the Hardware Change
This usually occurs when:
- You replaced your motherboard
- Your Microsoft account wasn’t linked before moving
Fix:
- Sign in with the same Microsoft account used on the old PC
- Go to Settings → System → Activation
- Select Troubleshoot
- Choose I changed hardware on this device recently
If the licence is eligible, Windows will reactivate automatically.
When You Can’t Transfer a Licence
A transfer is not permitted if:
- The licence is OEM (came preinstalled)
- It was volume-based (business or enterprise KMS/MAK)
- It was supplied by a workplace or university
- It originated from a subscription programme (e.g., MSDN)
If you need to license multiple devices legitimately, consider:
Bulk Windows Operating System Licence Keys
Should You Upgrade Instead of Transfer?
If your old licence can’t move, or you’re switching editions, upgrading may be simpler.
You may want Windows 11 Pro if you need:
- BitLocker drive encryption
- Remote Desktop Host
- Hyper-V virtualisation
- Group Policy control
- Domain joining support
View upgrade option:
If you only need the standard edition:
Frequently Asked Questions
Do I need to deactivate Windows before moving the licence?
Not always, but it’s strongly recommended. Uninstalling the key from your old PC using
slmgr /upk helps prevent activation errors when you move the licence to a new device.
Can I reuse my Windows 10 key after upgrading to Windows 11?
Yes, if your key is a Retail licence. A Retail Windows 10 key can usually be used to activate Windows 11 on a new PC, as long as it’s only in use on one device at a time. OEM keys remain tied to the original hardware.
What happens if I changed my motherboard?
If you change your motherboard, Windows may treat it as a new device. This can cause activation to fail. Make sure your Microsoft account is linked, then go to Settings > System > Activation and run the activation troubleshooter using the option “I changed hardware on this device recently”.
Can I transfer Windows if my laptop no longer works?
If the licence is OEM (preinstalled by the manufacturer), it normally cannot be transferred, even if the laptop is no longer working. If you previously purchased a separate Retail key and activated it on that laptop, you may be able to transfer that Retail licence to a new PC.
Will Windows activate automatically on my new PC?
It can do, if you have a digital licence linked to your Microsoft account and it originated from a Retail licence. Sign in with the same Microsoft account on your new PC and, in many cases, Windows will activate without you needing to enter the product key again.
What if my product key shows as already in use?
This usually appears as an activation error such as 0xC004C008. First, ensure the key has been removed
from the old PC using slmgr /upk. If it still won’t activate, run slui 4 from the Run dialog
and follow the steps for phone activation.
Gary Walsh is the Head of Tech Support at Software Supplies, with more than 20 years in the IT industry. Fully Microsoft-certified and experienced across the full business software stack — from Windows and Office to cloud infrastructure and device management — Gary delivers practical, no-nonsense advice that helps users and businesses get the most from their technology.
