Drumkit From Hell works as a virtual instrument, so you'd need a program that can host VSTi plugins. DFH is essentially a cohesive sample library, but you still need a sampler to use it. You could use Fruity Loops to program drums (there's a shitload of free drum samples out there), or you could use DFH inside Fruity Loops. I would recommend trying Fruity Loops by itself first. ***, there's no reason to use Reason as Fruity Loops does everything Reason can do, plus a lot more.