Well, actually, it doesn't freeze. Rather, I've left it for as long as half an hour and it has, indeed, not updated the boot caches. I have no clue what's wrong, but when restarting the computer after running software update, this can be a real problem. I know there have been some problems with people regarding iPhoens 3Gs and this, but I have never plugged an iPhone into this computer. Boy, I love updating system software. How to fix?