I started my second game, and tried it on my XP-64 bit system. It works well, with no issues unstalling or running so far (I didn't see XP 64 shown as a supported system in the specs). I started this game in a windowed game, at 1600x1200, and find that the scroll areas are quite small, and inconsistant. If you go too far, you are out of the window, and no movement. If you are about 1/4 to 3/8's of an inch away from the edge, the window scrolls, but this can be erratic, and if you move a little bit, changes speed very quickly. I'm spending a good amount of time trying to center on each area of interest I want to look at.