Installing clean or fresh copy of Windows 10 operating system involves removing your old operating system and erasing all the content of the drive were your previous operating system reside. Clean install is also used when you have a new hard drive and want to install Windows in to this drive, remember that clean install means wiping all the content of the drive or partition where you want to install Windows, therefore before you clean install a new operating system it is a must that you save all your important data files to other drive or using an externar HDD drive, otherwise they all be gone after you clean install your new operating system.
What you need when clean installing Operating System.
Envoke boot priority by pressing F12 or F8 during B.I.O.S Power-On-Self-Test and select the DVD drive where Windows installer reside. If boot selection menu don't appear by pressing F12 or F8 then you have to manually set your boot device priority in the BIOS menu or activate the F12 boot selection at the BIOS menu.
When you see this screen, press any key on your keyboard to boot on the CD/DVD drive or USB drive
Click Instal now to begin installation of Windows 10
Click on "I accept the license term" checkbox then click on the "Next" botton
Select "Custom: Install Windows Only (advanced)"
Click on the available unallocated space and click on "New" or if Windows 10 is previously installed on the drive, then click on that drive and click on format drive.
Select the higher drive capacity then click the "Next" button
Windows 10 installation will now continue, Windows 10 installation will restart several times, this might take several minute to complete
Windows 10 Cortana will be here to assist you
First you will be ask for your Region then click "Yes",
next You'll be ask for the type of keyboard your using then click on "Yes"
next you can connect to your network or you can click "skip for now"
Type the name you want to name your account and click the "Next" button. Then type your desired password. Next with Cortana your personnal assistant you can choose your privacy setting for your device when everything is okay you can "Accept" the setting to finish the setup.
In just a few minute your Windows 10 setup will be complete
Windows 10 installation is now complete.