In addition to the two Print Screen methods detailed above, Windows Vista and Windows 7 users can also utilize the Snipping Tool. This feature is available on all versions of Windows, with the exception of Starter and Basic editions, and Windows XP.
To open the program, click the Start button, select All Programs, followed by Accessories, and select the Snipping tool from the list. The Snipping tool lets you take a screenshot of a specific area of the screen (similar to the OS X command with the Command, Shift, and number 4 keys). Open the program, click New, select the area of the screen you would like to capture, and then click Save.