0 If you started with a package, we have already selected the best version of Windows for you.

If you are building your system from scratch, remember it's always best to include an operating system, to avoid the hassle and inconvenience of installing it yourself.

And don't forget: now's the best time to get a bargain copy of Microsoft Office. These rock-bottom prices are only available with a new PC you won't find them in the shops. Grab it while you can!

Windows 7 Comparison Guide - Windows 8 Comparsion Guide