I have had both sins and entrenchment installed on an xp machine and a vista machine with it running with no problems. I now also have a windows 7 RC machine (Q9550, 8GB RAM, Asus Maximus extreme mobo, ATI 4870 x2 running stable at stock clock speeds... for now). I have updated to the most recent ATI driver (they actually have one for windows 7). The mouse pointer in game flickers nd dissappears rendering the game unplayable. Does anyone have any suggestions?