How To Do A Clean Install Of Windows 10

How To Do A Clean Install Of Windows 10

Windows 10 is finally here, and your computer will automatically prompt you to upgrade. But if you’d rather start fresh, you can do a clean install — you just need to follow a few steps in the right order.

Doing a clean install is quite simple, as long as you make sure you have a valid licence. Here’s what you need to do:

  1. Back up all your data first! We do not recommend continuing until you have backed up any and all data on the computer you’re installing Windows on.
  2. If you bought a copy of Windows 10, you will have a licence key in the box or in your email. Grab this licence key and have it on hand. If you were previously a Windows 7 or 8 user, you are eligible for a free upgrade. However, according to Microsoft, you have to upgrade an existing computer to do so. So, even if you want to do a clean install, wait for the Windows 10 update to hit your computer, then install the upgrade first. It feels like a waste of time, but it’s the only way to ensure you’ll get your free licence. Once you’ve done so, you won’t need a key — just skip any prompts for keys, and after installing Windows 10 it should activate itself automatically.
  3. Once you’ve either got your licence key or installed the free Windows 10 upgrade, head to this page and download Microsoft’s Media Creation Tool. Launch it when it finishes downloading.
  4. Select the “Create installation media for another PC” option and click Next (even if you’re using the computer on which you’re installing Windows 10).
  5. Choose your language and edition of Windows. If you bought Windows 10, it will say which edition you have on the box or in your email. If you upgraded from Windows 7 or 8, you can check which version you have under Control Panel > System and Security > System.
  6. Choose what kind of media you want to create. We recommend using a USB flash drive.
  7. The Media Creation Tool will download and burn the installation files for you. When it’s done, restart your computer, keeping your flash drive plugged in.
  8. Boot from your flash drive. You can usually do this by pressing F12 (or a similar key) at startup, then choosing your flash drive from the list that appears. If that doesn’t work, read this article for more options.
  9. You should be greeted with the Windows 10 installer. Follow the initial prompts and, when given the option, choose “Custom: Install Windows Only”.
  10. Select the hard drive you want to install Windows 10 on. If you aren’t sure which drive or partition it is, look for the largest one, or the one that says “Primary” in the right column — that’s probably it (but make extra sure before continuing, because you will erase that hard drive!)
  11. Click the “Format” button. (If the Format button is grayed out, click “Delete”, then click “New”.) Press Next to install Windows on that drive.
  12. Allow the installation wizard to guide you through the rest of the process.

There may be other methods that work (we’re still investigating), but this method worked well for me. Once you’ve installed Windows 10, just grab all your favourite apps and enjoy setting up your fresh machine!


  • Can you use this method to upgrade other computers you have?
    I have several in my household and I don’t want to download 3-4GB every time I upgrade each PC.

    • You can use the ISO or USB key created by the download tool to upgrade all your other PCs. As per the article you need to run the setup from within Windows first to get the free licence.

      You also don’t need to upgrade one computer first before using the download tool. Note that the install program will still download some files for each PC.

  • The Media Creation Tool will download and burn the installation files for you. When it’s done, restart your computer, keeping your flash drive plugged in.

    nervous tick

  • Out of interest, does anyone know if it is possible to do the initial install to a different drive than the one my current instance of Windows is installed on? I’ve got a spare empty SSD sat unused and the one Windows 7 is sat on is pretty full, would be nice to be able to stick Windows 10 straight on the new drive.

    • As long as you have a valid Windows 10 Key (or have associated your old Win7 Key with Windows 10) then there is no logical reason you couldn’t do this.
      At worst, based on that train of thought, the Windows 10 Key association might be seen as an Upgrade Install key instead of a Full Install key.
      This would necessitate using the old “Install Windows and then Immediately Upgrade Windows from the same media” trick Microsoft started with Vista (thanks to the new Key System) to allow the key to be accepted by the activation servers.

  • Ah yeah any answers to loodles query?

    I have retrieved my windows 10 key by using key finder.

    Would like to slap on a new HDD with Win 10.

    • Probably too late a reply but I couldn’t manage it straight off – still had to upgrade the existing version then a clean install to the new SSD. Gave me a few headaches with the system still trying to boot two versions of Win 10 even after I formatted the original drive. Fingers crossed its all sorted now…

  • fresh install all done.
    the only thing to note is that the upgrade part has to be done from within windows first!
    dont reboot to usb and choose upgrade, it will just tell you to run setup from windows.

  • Ignorant when it comes to this…. I’ve got a Sony Vaio Duo which is continuously downloading driver updates… would updating to Win 10 render my computer relatively useless?

  • Just a question; has anyone tried this on a vendor OEM copy of windows? I have a HP laptop that I upgraded from 7 to 10, but its doing some strange things with the shell/explorer; considering a clean install but not sure if the license will transfer correctly when I do that. and don’t want to end up with an unlicensed copy of windows.

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