What you have attempted to create is a Class B amplifier, also known as a "push-pull" amp. (http://cnx.org/content/m32262/latest/
Two problems with the one you've made:
1) Though you've helpfully labelled your transistors as NPN or PNP, you haven't labelled which side is the emitter. This is an important distinction. Please update your schematic to include this.
2) You've got your PNP and NPN in the wrong place. As in the link above, the NPN's collector should be connected to the positive supply, and the PNP's collector connected to the negative. The emitters of both should be connected to the load.
Quite frankly, given the way you've got those transistors connected, I'm surprised you haven't destroyed them through overcurrent damage.