Easy.
1. Click on Windows 'Start'
2. Click on 'All Programs'
3. Go to the bottom where it says 'Search programs and files'
4. Type 'Snipping tool'
5. Use it,
6. If you don't know how to use it then just tell me and i'll explain
OR.
Press Prt Sc. then other stuff..don't really know that one since it doesn't work for me
End
^ Done.