Is Windows 8.1 Preview ready for everyone to try?
We strongly recommend that only experienced PC users download Windows 8.1 Preview or Windows RT 8.1 Preview. Before you download the preview, you should weigh the pros and cons of installing software that's still in development. If you install the preview release, you'll get to try out the many new features, but you might also encounter errors that you wouldn't encounter using a released version of Windows.
You should consider downloading the preview only if all of the following apply to you:
You like to use the latest software and enjoy experimenting with new technology.
You're comfortable backing up a PC, formatting a hard drive, and installing an operating system from scratch.
You feel comfortable troubleshooting PC problems yourself.
You don't mind updating software frequently.
You have or can create installation or recovery media and have the knowledge to restore your previous operating system after you're done testing Windows 8.1 Preview.
Warning
Warning
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If you're running Windows RT you won't be able to restore Windows RT after you install Windows RT 8.1 Preview. You'll be able to upgrade to the final version of Windows RT 8.1.
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If installation of Windows RT 8.1 Preview fails on your PC, you may need to contact your PC manufacturer.