Windows – How to take Screenshots
This document describes how to capture an image of the screen in all versions of Windows.
Press the Print Screen (sometimes marked as Prt Sc or Prt Scn) key on the keyboard (generally located in the top right hand corner) to capture an image of the entire screen and store it in the Windows clipboard.
Press Alt & Print Screen (sometimes labeled as Prt Sc) to capture an image of only the active window and store it in the Windows clipboard.
When the desired image is stored in the Windows clipboard (only one image can be stored at a time), it can be extracted by opening a word process program (Microsoft Word, Microsoft Publisher, etc.) or an image manipulation program (such as Adobe Photoshop or Microsoft Paint), and selecting Paste from the Edit menu or pressing Ctrl-V.
Windows 7 - Snipping Tool
Click on the Start button to open your Start Menu. The Start button looks like this: 
- Then click on the All Programs menu option.
- Then click on the Accessories group
- Finally click on the the Snipping Tool icon which looks like this:
http://windows.microsoft.com/en-CA/windows7/products/features/snipping-tool