Windows 8 System Requirements

You need a 1GHz or faster CPU (it also needs to support PAE or PAE-NX Physical Address Extension for new security features in the Windows 8 kernel), 1GB of RAM (or 2GB for 64-bit systems), 20GB of hard drive space and a DirectX 9 graphics card with WDDM driver.

• Windows 8 vs Windows RT: what's the difference?

If you want to use the Windows Store to download WinRT apps, you need a screen resolution of at least 1024 x 768, and if you want to snap two WinRT apps side by side, that goes up to a minimum of 1366 x 768.

Installing and upgrading

When you buy Windows 8 online you'll get a step by step download and installation, complete with the Windows 8 Upgrade Assistant to warn you about program and hardware compatibility issues, or you can buy a DVD.

You get the most options with an upgrade from Windows 7

How much of a previous Windows system you can keep when you install Windows 8 depends on which version you're upgrading from; upgrade from Windows 7 and you can keep programs, Windows settings and files; upgrade from Vista and keep settings and files. Upgrading from Windows XP only gives you your personal files.

• 50 Windows 8 tips, tricks and secrets

If you're installing Windows 8 Enterprise, you activate it once it's installed (and the system for that was still being set up when we started testing, so it wasn't seamless but this what you'll see as a normal user).

Even if you have Windows 7 on your PC, you can still choose a fresh start

With Windows 8 Pro the installation is the same experience as you'll get if you buy a Windows 8 upgrade; it checks your system, tells you what you can keep and which programs won't be compatible (and helpfully removes them and then restarts the installation) and you enter your product key as a normal part of the installation.

You don't have to restart the installation if there's an incompatible program installed

Scanning a fully loaded Windows 7 system with a lot of apps installed and many gigabytes of files takes around ten minutes, then another hour (or on a really loaded system, two) to set up Windows 8 with all your compatible programs intact. If you're doing a clean installation without keeping any applications, or an upgrade where you just keep files and settings, it's far faster.

On a variety of PCs it took ten to fifteen minutes from starting the installation and entering the licence key to get to picking the colour scheme and choosing whether to accept Express Settings or customise the setup.

One of the items under Express Settings is the controversial default of turning on the Do Not Track setting in Internet Explorer 10. Choose Customize and you can change that, but there's an on-going argument about both what Do Not Track means and how websites will treat the IE10 setting because it is the default. It's clearly marked and you can easily change it, but advertisers and some ad-funded organisations remain unhappy.

After this you can set up a local account or log in with a Microsoft account like a Hotmail address, which synchronises settings with any other Windows8 PCs you use and give you access to the Windows Store.

While Windows 8 finishes the setup, which takes a couple more minutes, you get a brief onscreen tutorial showing you how to move your mouse into the corners of the screen to open the charm bar; if you have a touchscreen, it also shows you how to swipe for the charm bar but only if you have the right screen – so an older tablet PC with only an active digitiser only shows the mouse tutorial. If you've picked a colour scheme, the tutorial uses that for the image of the screen, a little thing but it's a subtle way of making it feel more like your PC.

Once the mini tutorial has played a few times, the setup screen starts switching between various different colours – presumably to show you the other colour choices as well as reassuring you that it's still working. Everyone who has an account gets to see the tutorial when they first log in, making good use of the short time it takes to create the desktop the first time. (They don't get the colour show though).

If you do an upgrade install starting with Windows running, you'll never see the option to set the language for your keyboard or settings for date and time formats. If you boot from USB to do a clean install, you're asked to choose these settings but that's it, apart from Express Settings.

In neither case do you get to choose the time zone; Windows 8 either keeps the current timezone if you do an upgrade or sets it up automatically based on the language of the installer for a clean installation. A UK Windows 8 image kept the UK time even on a clean installation; a US image set the timezone to Pacific when we did a clean installation. And as always, you can change that quickly enough inside Windows without needing an admin account.

On a Sandy Bridge Core i5 with an SSD, fifteen minutes after putting in the USB stick, we were running Windows 8 and ready to sync content with the content in our Microsoft Account.