> For the complete documentation index, see [llms.txt](https://deploykey.gitbook.io/deploykey-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://deploykey.gitbook.io/deploykey-docs/windows-11-keys/existing-installation.md).

# Existing Installation

I already have Windows 11 installed but it's not activated and I have a product key.

{% stepper %}
{% step %}

### Open Settings

Press Windows key + I, or right-click the Start button and select "Settings".

{% endstep %}

{% step %}

### Navigate to Activation

Click on "System" in the left sidebar, then scroll down and click on "Activation".

{% endstep %}

{% step %}

### Change Product Key

Click on "Change product key" next to the activation status.

{% endstep %}

{% step %}

### Enter Your Key

Type your 25-character Windows 11 product key in the format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

{% endstep %}

{% step %}

### Activate Windows

Click "Next" and then "Activate". Windows will verify your key and activate automatically if valid.
{% endstep %}
{% endstepper %}

{% tabs %}
{% tab title="Alternative Command Line Method" %}

```powershell
slmgr /ipk YOUR-PRODUCT-KEY-HERE
slmgr /ato
```

{% endtab %}
{% endtabs %}