Thanks... I'm doing an update right now... 2 hours left on the download though 😡
EDIT: Hm... that was weird... it just leapt from 150mb to 675 in like a second...😱 Now it says the download is done... I'll try restarting and see what happens
EDIT 2: Well that didn't work at all... I'm just gonna download the combo update from Apple's website because I seem to remember that there were problems with the software update one. Also, my "About this Mac" screen shows Version 10.5, which is lower than the version that came with the Macbook Pro (10.5.4), so I'm guessing that's what the problem is.