A while ago we showed you how to get a Windows 10 ISO for a clean install. Today we’ll go in-depth on how to fully perform a clean install of Windows 10 from beginning to end.
Let’s get started.
Step 1 – Configuring your computer’s BIOS*
Start by inserting your Windows 10 installation media into the PC — this can be a DVD or USB flash drive. If you haven’t created it yet, read our article on how to create a Windows 10 USB flash drive. Now restart the computer and enter the BIOS (F2, F9, F12 or Del on most PCs).
After pressing the correct key, navigate to the Boot section of the BIOS, using the right arrow key.
The controls of each BIOS are usually displayed at the bottom (unless you’re lucky enough to have a GUI BIOS – in which case you’ll be able to use the mouse to navigate). Use these to navigate to the device from which you will be installing Windows and to place it at the top. I’ll be using a DVD, so I’ll place “CD-ROM Drive” at the top. If you’ll be using a USB drive you should move “USB Device” or “Removable Devices” to the top.
Once you’re done with changing the boot order, use the right arrow key to move to the Exit section of the BIOS. From there you’ll want to select “Exit Saving Changes” followed by a Yes or “y”.
After this your computer should be able to restart straight into the Windows installer.
Step 2 – Installing Windows 10
After rebooting you should see the Language select screen. From here, simply select your desired language, time and currency format, and keyboard input. Then press Next to continue.
On the next screen simply press the “Install now” button.
You’ll need to agree to the Microsoft EULA before you can continue. Read it (…or not) and tick the check box before pressing “Next”.
To perform a clean install, you’ll need to select the “Custom: Install Windows only” option. As the installer says — you should have a backup of your files and programs in order to copy them to the new installation after it’s complete.
This next part may be a bit tricky if you have multiple hard drives or partitions. You’ll need to delete the primary partition and the system partition. To ensure a 100% clean install it’s better to fully delete these instead of just formatting them.
After deleting both partitions you should be left with some unallocated space. Select it and click the “New” button to create a new partition.
By default, Windows inputs the maximum available space for the partition. I’d advise you to leave the size as-is and press “Apply“.
After creating the new partition(s), select the primary one and press “Next”.
The Windows setup should now begin. Clean installs are usually significantly faster than upgrades so you should get from this…
… to this in a matter of minutes.
After “Finishing up”, you will be notified that Windows will now restart.
Step 3 – Configuring Windows
After the reboot, you should be greeted by the following screen. The default Windows 10 settings are perfectly fine and don’t really mess with your privacy, so we advise you to Use Express settings. Optionally, you can also Customize the settings if you insist on turning some features off.
Windows will now go through a few setup procedures.
Once you reach this screen simply fill in your new account details and press Next.
Windows will now go through the final steps of setting up…
…and will boot straight to the Desktop afterwards. Congrats! You just successfully installed a clean Windows 10 all by yourself! :)
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