lol exactly in this moment i wanted to post the same issue. I'm having the same problem on the same windows with my new intel iMac. updater, psclient and pssetup now ceased to work compleaty. Two Days ago i read through an other thread, where someone advised "crossover", to use the pc version on a mac. The funny thing is, that running it causes the same grafic bugs. But it is still lauchable and playable, appart of the tiny problem that my computer freezes when i press the run button (apple+alt+esc doesn't help)..
So maybe this is a intel mac problem.