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There's a couple of options; you can download an upgrade from Microsoft that will upgrade Windows XP, Vista or 7 to Windows 8. Usually this is a DVD burnable ISO, but it's also possible to download a version for booting from USB stick, Microsoft also sells DVD copies of the operating system. The upgrade program checks the devices installed and notifies you which will not work under windows 8 - usually these are things like USB 3 drivers (which aren't required for Windows 8) or Security Essential - which is built-in to the OS now.

If you upgrade from Windows 7, your existing applications and data will be kept, for earlier versions you'll be obliged to re-install everything.

To install from scratch, the procedure is very similar - you'll need a different (and more expensive!) key to install Windows 8 onto a fresh machine.

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12y ago

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