Though you could install Windows 8 on an older Win 7 system and use it solely with a mouse and keyboard, the market is filling up with touch-friendly PCs designed to be used with Win 8. These include traditional notebooks with touchscreens, as well as dockable tablets, all-in-ones with articulating displays, slider PCs and convertible laptops whose screens can twist and fold back into tablet mode. In general, we'd strongly recommend any of these over a PC that doesn't have a touchscreen.
What we've learned -- and what we couldn't fully appreciate before testing some of these new devices -- is that Windows 8 is at its best when you have the option of interacting with it using your fingers. It doesn't matter so much if you have a touchscreen, a modern touchpad or an external trackpad that supports Win 8 gestures. The point is, many of Windows 8's most enchanting features (the Charms Bar, etc.) are easy to use this way, but frustrating if all you have to work with is a mouse. If you have an older system whose touchpad won't support Windows 8 gestures, you might want to stick with Win 7 until you're ready to buy a new PC -- without that touch input, many of those new features will be lost on you. For people with more touch-friendly hardware, though, Windows 8 is easier to use than you may have feared. Its tablet-style apps, multitasking features and desktop enhancements add up to a balanced mix. It's an OS you can use seamlessly on a tablet, but with features like Snap, Switcher and File Explorer you might well be more productive than you ever were on an iPad or Android slate. Just don't lose faith as you're climbing your way across that learning curve.