I have been working on computers all of my life and I'm a Server Engineer at a local business, so I am pretty good about making sure my PC is ok. I just purchased all of this hardware, minus the 5770, back in October. It's a brand new OS install of Windows 7, and I definitely defragged after installing the game.
I have a GeForce 570 coming in the mail tomorrow which I'll try out and compare with how my 5770 has been doing. With that said, to have the game run so poorly on a 5770 is unacceptable given how horrible the game looks.