We're about to enjoy the biggest change in Windows since the Rolling Stones helped start Windows 95: when Windows 8 ships later this year, it will come in three key flavours. Windows 8 is the standard version, Windows 8 Pro has some more features for power users, and Windows 8 RT ? the RT is short for Runtime ? is completely new and completely different. Which one will you want to have on your next PC, your Windows 8 tablet such as Microsoft Surface or your current Windows PC? Let's explore the options.