Upgrade from dual-core

I am looking into buying a used setup for a gaming pc.
Currently I'm running a HP p6000 with dual-core and factory graphics.
I would like to upgrade so I can play games such as skyrim,call of duty and a few others.
I found an add for some nice looking parts just wanted to see if anyone could let me know if it looks like it would be an decent upgrade based on my needs for it.

Selling PC Parts that are from a custom gaming computer I built. The CPU, CPU Cooler, Motherboard, and RAM are all installed together. All the parts work and I have gotten good performance out of them.

8 Core AMD FX 8120 3.1 GHz Processor

Zalman 9900 MAX CPU Cooler

ASRock 990 FX Extreme 3 Motherboard (Mounting screws included)

NVIDIA ASUS GeForce GTX 570

Corsair Vengeance 8 GB (2x4GB) DDR3 RAM

Antec 1200 Watt Power Supply (Power Cord included)

That is what the posting was for. I do understand that the parts are not the latest tech but I'm also not a looking for a super computer just want to play Skyrim mostly.
Thanks for any help it's greatly appreciated
 
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