First, check if it is installed, because it doesn't add an icon to the desktop.
Click the start button, and type "SQL" - you should get three items under "Programs":
https://www.dropbox.com/s/1jjgn4t5jpw0an0/Screenshot%202014-06-28%2005.44.18.png[
^]
The one you want is number two: "SQL Server Management Studio"
If you see it, then find - run it and you're good to go.
If you don't, then go to Control Panel...Programs and Features.Double click SQL Server 2008 R2, and select Add. Follow the dialogs, and make sure you include "Management Tools Basic" and "Management Tools Complete". (I'd give you a screen shot, but I don't want to mess up my installation accidentally!).