Hello Miles. I see that you were able to get your dv9640us to load XP, I too purchased my dv9640 about a month ago. I am trying to do that as well but the issue is that my BIOS does not list SATA Native Support or anything even similar to that. I just loaded the latest BIOS, F.23, yesterday and I was wondering what your BIOS version was. All the other steps that I need to follow make sense to me but I just can not get my XP installer to load special drivers (F6 when in setup) and it does not see a hard drive to install to (which I believe is for the fact of that the BIOS will not let me disable the SATA support. Any help you or anyone could offer would be greatly appreciated. Thanks!