Step 1: If you haven’t downloaded your Windows 10 ISO yet, please follow the instructions in our download Windows 10 ISO from Microsoft guide to download the ISO image file. Here is how to clean install Windows 10 from the ISO image file without having to create a bootable USB or DVD. Perform a clean install of Windows 10 from ISO image If at all, Windows 10 is not activated after the clean install or reinstall, use the built-in activation troubleshooter to fix the issue. However, when you clean install Windows 10 on a different PC or newly built PC, you will have to enter a valid product key.

Your PC will be automatically activated after installing Windows 10 as long as you have installed the same edition of Windows 10 was activated on your current PC by using the free upgrade offer. When you are prompted to enter a product key during the product installation, click the Skip button. Likewise, if you got Windows 10 preloaded on your PC and activate your copy of Windows 10, you have nothing to worry about. Note that you won’t need a product key if you have legally upgraded your current PC from Windows 7/8.1 to Windows 10 and successfully activated it, before clean installing Windows 10 on the same PC. The only difference is that we are not going to create bootable media while installing Windows 10 directly from the ISO file. Clean installing Windows 10 from ISO is not vastly different from clean installing Windows 10 from USB or DVD. Well, it’s possible to clean install or reinstall Windows 10 from an ISO file. Install Windows 10 directly from ISO file All you need is Windows 10 ISO, which you can get from Microsoft with the help of the official Media Creation Tool. To clean install or reinstall Windows 10, you don’t need to prepare a bootable USB of Windows 10. Traditionally, when it comes to installing or reinstalling Windows, users prepare a bootable media and then use it to install/reinstall Windows operating system.

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