To activate Windows 10, follow these steps:
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Go to Settings: Click the Start button, then select Settings.
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Navigate to Activation: In the Settings window, go to Update & Security, and then click on Activation.
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Enter your Product Key:
- If you have a valid 25-character product key, click on Change product key.
- Enter the product key in the provided field.
Windows 10 should then activate automatically after you enter the product key and it's validated. If you don't have a product key, you'll need to purchase one from Microsoft or an authorized retailer.