SOLVED: The problem was with my RAM. I had a bad 2gb stick. When trying to install with that stick inserted, or with a 3rd stick that didn't have another to complete the dual-channel setup (i have 4 ram slots), windows would install corrupted. I was kind of 'forcing' the install when i used a usb stick. My bad RAM forced a corrupted install.
That bad stick also causes my AMD display driver
when using it with a good install, in case any of you are having problems with that. RAM actually causes all kinds of problems that can seem unrelated. When i searched for corrupted installs, or the 0x80070570 error, absolutely no useful information came up regarding RAM, but it makes a whole lot of sense. All that information is passed through the RAM so corrupt RAM can easily lead to corrupt installations or failures altogether(like the 0x80070570 error).
I have no explanation for that other user who discovered his with a computer he bought, other than that his installation may have been corrupt as well.