screenclip
ScreenClip is a free lightweight screen capture utility for Windows.
...No installation is necessary and the utility does not require administrative privileges to run. Start the utility initially by double-clicking on the downloaded executable file. Place the executable file in your Startup folder to have it start automatically when your computer starts.
Screenclip is a compiled AutoHotKey (AHK) script. See http://ahkscript.org/ for more details.