When I format my laptop, will I lose Windows?
Basicamente não, mas leia este antes de prosseguir:
How you activate Windows 10 after reinstalling it depends on how Windows 10 was originally installed on your device.
If you activated your free upgrade to Windows 10 or bought and activated Windows 10 from the Windows Store, you have a digital entitlement for your device. This means you can reinstall the same edition of Windows 10 that your device has a digital entitlement for without entering a product key. During reinstallation, if you’re asked to enter a product key, select Skip. Your device will automatically activate online after the installation is complete.
If you previously installed and activated Windows 10 using a product key, you’ll need to enter the product during the reinstallation.
Starting with Windows 10 Insider Preview Build 14371, you can link your Microsoft account to the Windows 10 digital license (formerly called digital entitlement) on your device. This can help you reactivate Windows using the Activation troubleshooter if you make a hardware change later, such as replacing the motherboard.