I have a 2.33 GHz 24" iMac (the white one) on which I've been running XP in Boot Camp. Mac OS version is 10.4.11. I've been happily playing City of Heroes with no issues until very recently. I think it was after SP3 that I started getting crazy graphical errors, polygons missing, and eventually the game and often Windows crashes. (I couldn't swear that it was after SP3 but I'm pretty sure.) The iMac has a GeForce 7600 GT and downloading the newest NVidia drivers has not helped at all. I often get a "driver crashed the system" message. Any thoughts? Thanks for your help.