Yop Daf ,
Print Screen is always accessible, as it's built-in, ... by the way, I prefer advising you these 2 tools.
: capture (screen, window, active window, region, fixed region to any type of output: file, mail, clipboard, print)
: capture too, but the movie way. Ideal to create presentation and tuts.
Both are downloadable as trial softs here :
And here you can find about 250 progs of this type (lots for free) :
Have a choice ! :p