At first I thought my new Quadro 4000 For Mac made the computer freeze when I tryed to enter BootCamp (http://forums.macrumors.com/showthread.php?t=1535810). But I was wrong. The real problem is that BootCamp freeze when I have 2 Graphic Cards installed at the same time (in my case it's the Quadro 4000 For Mac and the GeForce GT 120). I red a couple of topics about it but non of those seems to solve the problem: http://forums.macrumors.com/showthread.php?t=1178714 (Most topics are about using dual Quadro 4000 for Mac, in my case, it's using 2 graphic Cards, as listed before). I actually booted in BootCamp with the Quadro 4000 For Mac and installed the most recent drivers on the Windows 7 side, then everything worked perfectly. I thought everything will works, so I reinstalled the GeForce GT 120, and tried to boot on the Windows side, but it freezed at the moment I pressed the Enter buton to enter in Windows. On the Mac side, everything works smooth with both graphic cards, it's only when trying to enter in the Windows side that it freeze. Anyone have an idea of what's the problem here? Btw here's some specs: Mac 4.1 - OS X 10.6.8 - Windows 7 - BootCamp 3.3 - Lastest Quadro drivers installed on the Mac and Windows side + CUDA drivers installed on the Mac side.