Windows 7 has a great little utility, the Snipping Tool, hidden away where most users don’t find it.
If you click the Start button, and type in “snipping” it will show up as the the
Snipping Tool. It lets you highlight an area of the screen to “grab” that as an image and saves it in your clipboard so you can paste it into a document or email, or you can save it as a picture from the snipping tool. For some people, this is one of those great little tricks so you don’t have to open another application (e.g. MS Word, Paint, Paint.NET, or Photoshop) and crop a “Print Screen” screenshot. It’s a handy little tool.
Check out this 1 minute video from Microsoft to see it in action.