Avid Pro Audio Community - Pro Tools 7.3 LE keeps crashing on startup!!

I'm running Pro Tools 7.3 with an Mbox2 on a Macbook, when I click on about this mac it says version 10.5.8...Pro Tools was working fine last weekend...did a software update for my macbook, didn't open up pro tools until now..and it crashes EVERYTIME when I try to load it up. I've tried uninstalling and re-installing alrdy. This is what it says in the log.

09/10/10 10:23:53 PM [0x0-0x2a02a].com.digidesign.ProToolsLE[1795] /Volumes/192.168.0.4-38/work/plugsv5/wafx/WaPlugin.cpp(68) : [22:23:53] in WaPluginC

09/10/10 10:23:53 PM [0x0-0x2a02a].com.digidesign.ProToolsLE[1795] ;g

My search doesn't work for my mac so i can't find that...

Does 7.3 not work on this OS? Is there a way for me to upgrade, or just run 7.3 without having to spend any extra money... I also have a PC with WIN7 but I'm guessing there's no way to get 7.3 to work on that either.