Os 10.6.4 has killed my system

During the update process, the installation hung and I was forced to reset. My system won't boot now and I want to boot into Safe Mode but here's my problem:
I was setting up XP on Bootcamp yesterday and didn't finish the installation. My mac has set itself by default to boot Windows but there is no installation and I cannot install it.
Therefore when I hold shift to launch my Mac into safe mode, it doesn't register and instead trys to find the Windows installation that doesn't exist.
Does anybody have any ideas? I'm completely stuck lol

taxilian,
Your problem was not caused by the 10.6.4 update. It was caused by the damage Disk Utility reported but could not repair. Unfortunately, this kind of damage can go undetected until a large number of changes are made to the file system, progressively doing more damage. Since very little makes more changes at once than an OS update, applying one is a very effective if highly undesirable way of discovering this problem.
It is possible a more powerful utility like Disk Warrior (about $100) can repair the damage but there are no guarantees it can.
The simplest solution is to erase the drive (& the damage along with it) but of course this means you must have a good backup.

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