There are two versions of Windows 8, or more precisely, there’s Windows 8 and there’s Windows RT. They look the same, but they run on different processing chips. Windows 8 runs on standard chips from Intel and AMD and is the version you’d get if you’re upgrading your home desktop or notebook PC. Windows RT is the version for light, small tablets and laptop-tablet hybrids. Windows 8 will run programs written for older versions of Windows. Windows RT won’t.