Windows 8 is for tablets. It's not going to be an interface for all computers.
HP Shopping is selling the same desktop computer under two different model numbers. One model number has Windows 8 and the other model number has Windows 7.
The stock market journalists and analysts still don't understand the difference between a coffee-shop browser and a PC. Windows RT is not going well but there is a buzz about Atom Tablets. The Atom tablets are just not yet, very much in stock, but search for the Samsung ATIV 500T at $750 including optional keyboard.