I joined this forum just to reply to your thread

, so HI
I just purchased this game yesterday and I was experiencing crash to desktop every time I changed maps (at load screen). I then was being asked to send error report (which I did). The error was a memory address error with different address than yours of course. I have my computer overclocked and tweaked to the hilt so what I did was lowered my overclock a bit to relax the stress on my memory instead of relaxing the memory timings. I also lowered my overclock on my x800xt. I haven't received the error since then. Damn well played the game till 2am last night (boy I am tired at work today, nearly falling asleep at my desk).
Due to your responses, I don't think that your system is overclocked any unless your friend has done it without you knowing. So keep playing with memory timings.
I am going to raise my overclock back up to (12x210) and on my GPU as well and put my memory (ocz 2x512 pc3500) back to its default timings of 11,3,3,2.5 and see if the error occurs again. If not then I know it was memory settings.
I will post more findings.