Stuck in Restart Loop after Software Update

I recently ran the update to 10.5.3 a few days ago, and thankfully, it's been working great... until today, when I installed two seemingly innocuous updates via Software Update: one for the latest version of Quicktime and another for Apple Brother Print Drivers 1.1. After restarting, everything fell apart. Several of my start-up apps unexpectedly quit after login, and other apps either failed to launch when I tried opening them, or they simply got stuck in an endless loop of bouncing in the dock. I couldn't even force-quit them because they weren't responding at all. Thinking this strange behavior to be symptoms of some permissions issue, I popped in the Leopard installation CD and ran a permissions repair. It fixed several cryptic problems, one for something to do with Java and another for the cups folder, which I assume has some relation to the printer driver update. I then tried selecting my start-up disk and restarting, but the problem only got worse. Now my iMac is stuck in a restart loop. I tried booting in safe mode, but that hasn't worked. If worse comes to worst, I'll have to revert to a Time Machine backup, or else run an Archive & Install, but I'm trying to avoid that. Any suggestions? I'm also curious to know if these two updates had any relevance to these problems, and if so, what the cause may be. I'm thinking the printer driver is to blame, but then again that's only a stab in the dark. Any help would be appreciated. Thanks!

Thanks for the suggestions. I tried a Safe Boot again but unfortunately that didn't work, so I had to go ahead and do an Archive & Install. Now everything is up and running; however, I'm going to stay away from that print driver until I figure out exactly what went wrong. I did a little research and saw it listed on MacUpdate.com, where it was posted along with an interesting note: apparently, the update can only be applied if there is already a Brother print driver installed (in this case there was), and in addition to that, the printer must either be connected (and I assume on for the computer to know it's connected in the first place) or have an active print queue for the update to even be listed in Software Update. Strangely enough, neither of these conditions held true when I saw it in Software Update... so I think that might have been the cause, but I can't be sure. I was wondering if anyone else has installed this update successfully, and if so, what they did?
Thanks again for the suggestions.

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