I have a 600GB drive with Win7 on it and everything from my old PC (Dell XPS 420) and I just bought me a few parts to build a new PC. New mobo, cpu, hdd (for storage of videos), ram and a case. (I recently upgraded my XPS's sound card and video card (750Ti) so I don't need those parts... I was hoping that I can just start with my old HDD but am unsure if it will work with the new parts...