Crash after installing 10.6.8 update

After installing the 10.6.8 update on my Macbook Pro, it now crashes on startup every time. I can boot only if I do a safe start by holding down the shift key. I've tried repairig permissios and reinstalling several times. Anyone have any other ideas?
What would happen if I would reinstall Snow Leopard from the original disk?

What would happen if I would reinstall Snow Leopard from the original disk?
It should be fine and hopefully you have all your important files backed up before doing so.
Before reinstalling the Mac OS X, boot from your install disc, run Disk Utility to verify the startup disk in case it needs repairing.
Using Disk Utility to verify or repair disks
Repairing the startup disk may save you from having to reinstall the Mac OS X.

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