Reformat Hard Drive and Reinstall Windows

Hi The Philly Lawyer, you can reinstall Windows 10 at any time, you will not need a Product Code and it will not cost you anything !

Since you previously had Windows 10 installed and activated on that PC during the installation process skip the steps which ask for a product key and select the option 'I am Reinstalling Windows 10 on this PC', and activation will not be an issue, your PC will have a digital entitlement stored on the Microsoft Activation Servers

IMPORTANT

Make sure you install the same Edition of Windows 10 (Home, Pro . . . etc.) you previously had installed to avoid Activation issues

Click this link:

https://www.microsoft.com/en-gb/software-downlo...

to download the Media Creation Tool (Click on Download Tool Now), with that you can download the latest Windows 10 ISO (Select Create Installation Media for Another PC), you can create a bootable USB flash drive (min 8GB) using that tool

Then, Boot your PC from the Installation Media you just created (change Boot Order in your BIOS) to begin installing Windows 10

If you have problems booting from a boot disc, you may have UEFI BIOS:

Insert the Bootable Installation Media, then go into your BIOS and make the following changes:

1. Disable Secure Boot
2. Enable Legacy Boot
3. If Available enable CSM
4. If Required enable USB Boot
5. Move the device with the bootable disc to the top of the boot order
6. Save BIOS changes, restart your System and it should boot from the Installation Media

If you are installing Windows 10 on the same computer and you have formatted only hard drive and your previous installation was activated, you need not worry about the key. Microsoft activation servers keep a digital record corresponding to key for your computer and during / after installation, it will check for the record in the server. It will activate automatically.

If you are prompted for entering a key, just click I don't have a key and do this later.