OK I need to stress that if a deal seems too good to be true, it probably isn't.
That PSU is only rated at 420 Watt, or so they say. It's probably rated at 350 watts truly. That means if you plug in that graphics card that comes with it, it will fail on you. It's also poorly made and a bad quality PSU, it's a ticking timebomb in your computer.
You need to get a windows 7 or 8 CD, preferably 64 bit so you can use the 8 gb of ram, and buy a quality PSU otherwise your system WILL fail and when that PSU goes it will take other parts with it. Be sure to buy a plus rated one like this:
http://pcpartpicker.com/mr/newegg/rosewill-power-supply-hive650
Good luck and don't forget to pick a best answer!