Or in case you would like to see windows 8 looks on your windows 7 system you should read the article below.
Another most common problem faced by users using windows 8 is that it does have a classic start menu like windows 7, if you want to solve this issue read the article below.
above procedure will help you disable the windows 8 start screen and see a classic start menu but not both at the same time, but recently a new software called Windows 8 Developer Preview Tweaker program has been released
which allows you to work classic start menu and start screen together in windows 8 side by side. It also allows you to change the start screen wallpaper and enable the windows 8 snap feature as well.