take a screenshot on windows 7

To take a snapshot (screenshot) of a window do alt+PRINT and then ctrl-v.

If you do just PRINT, you will get a screenshot of the whole screen.

To take the snapshot as a jpg picture

• start the paint program Start -> run -> mspaint
  
• "Select the window of interest" -> alt+PRINT -> go to mspaint window -> use ctrl-v to paste -> save as .jpg.