I've been trying unsuccessfully for the past 2 days to install 7.4.5. All the other updates went in fine, but trying to get quicktime up and running is impossible. The computer will log out, take me to a blue screen, with a spinning wheel (not the beachball). The wheel will then fade away, the screen will flicker, and before you know it, it goes back to square one. What give? I repaired permissions, i've tried it several times. Can I not get quickime updates?