Follow the instructions to finish installing Windows 10.When you've finished formatting, click Next.Click the partition that you want to change, click the formatting option you want to perform, and then follow the instructions.On the Where do you want to install Windows? page, click Drive options (advanced).On the Which type of installation do you want? page, click Custom.From the pop-up that appears, click ‘Keep my files’. Click on Recovery, then ‘Get started’ under ‘Reset this PC’. On the Please read the license terms page, if you accept the license terms, click I accept the license terms, and then click Next. How to reinstall Windows 10 Provided your computer can boot into Windows 10, open the Settings app (the cog icon towards the bottom-left of the Start menu), then click on Update & Security.Reset this PC for a Clean Install This should be your first option when trying to completely wipe your computer and re-install Windows 10. Reinstall from inside of Windows with installation media. On the Install Windows page, enter your language and other preferences, and then click Next. Reinstall by rebooting with installation media like a DVD or bootable USB drive.If your current version of Windows still starts, try again by waiting until Windows asks you to sign in, and then restart your PC again. To change the boot order, you'll generally press F12 immediately after you turn on your PC.

If you restart your PC and your current version of Windows starts, you might have to change the boot order in your PC's BIOS settings so that your PC boots from the media.

Turn on your PC so that Windows starts normally, insert the Windows 10 DVD or USB flash drive, and then shut down your PC.

Please backup system data before upgrading to Windows 10.

If you bought Windows 7 SP1 or Windows 8.1 on DVD or created a DVD or USB flash drive when you purchased and downloaded Windows 10, follow these steps to perform a clean installation.

Reinstall fresh windows 10