If you draw on puzzle piece, place it on top of the image, select both and hit ctrl+7 (mask) it will make a piece for you. This could get costly if you do that for each shape since you would need a copy of the image for every shape. If you want the rest of the puzzle to appear assembled maybe just draw the outline of the pieces and place it ontop of the picture. If you dont need to see through hole the missing piece creates, just put a copy of the shape you made your mask out of, color it the same color as you background and move it to where the hold should be. I'd buy a Mac if I could afford one.