that doesn't already have an existing version of Windows,
which typically means formatting a
partition on your hard drive in Windows Setup before you
begin the installation.
You can perform a clean installation of Windows 8.1 or Windows 8
using installation media, such as a DVD or USB flash drive.
If you bought Windows 8.1 or Windows 8 on DVD from a
participating retailer,
or created a
DVD or bootable USB flash drive when you downloaded Windows using
Upgrade Assistant,
follow these steps to perform a clean installation.
If you format a partition during installation, any data on the partition will
Be sure to back up any data you want to keep before you begin.
Turn on your PC so that Windows starts normally, insert the DVD or USB
and then shut down your PC.
- flash drive,
Restart your PC, and then press any key to boot from the DVD or
USB flash drive.
If you restart your PC and your current version of Windows starts,
you might have to
open a boot menu or change the boot order in your PC's BIOS or
UEFI settings
so that your PC boots from the media. To open a boot menu or
change the boot order,
you'll typically need to press a
If your current version of Windows still starts, try again by waiting
until Windows asks
you to sign in, shutdown completely, and then restart your PC again.
combination of keys (such as F2, F12, Delete, Esc, etc.) immediately
after you turn on
your PC. For instructions on changing the boot order for your PC,
check the
documentation that came with your PC or go to the
manufacturer's website.
On the Install Windows page, enter your language and other
preferences,
and then tap or click Next.
Tap or click Install Windows.
On the Enter the product key to activate Windows page, enter your
product key.
The product key should be on the box that the Windows 8.1 DVD came in,
or in a purchase confirmation email. It looks like this:
PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX.
On the Please read the license terms page, if you accept the license terms,
tap or click I accept the license terms, and then tap or click Next.
On the Which type of installation do you want? page, tap or click Custom.
On the Where do you want to install Windows? page, do one of the
following:
In Windows 8.1, tap or click the partition that you want, tap or click the
formatting option you want to perform if needed, and then follow the
instructions.
In Windows 8, tap or click Drive options (advanced), tap or click the
partition that you want to change, tap or click the formatting option
you want to perform if needed, and then follow the instructions.
When you've finished formatting, tap or click Next.
Follow the instructions to finish installing Windows.
For info about how to download Windows, see Upgrade Assistant: FAQ.
To learn how to refresh or reset your PC and reinstall Windows, see
How to refresh, reset, or restore your PC.
For info about how to update to Windows 8.1 in the Windows Store, see
Update to Windows 8.1 from Windows 8.
To perform a clean installation using a DVD or USB flash drive
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