"Samsung hd103sj hdd, windows 7 was already installed to this from my previous pc"
You cant pull your old harddrive out and hook it up to a new system and boot it right up, none of the drivers are the same. THIS WILL NEVER WORK.
You need a full reinstall of the os. Most likely you will need to buy a new copy of windows as the keys are non-transferable to the new system