Recent security update...now programs wont open

I recently did the Security Update for Quicktime 2007-001. Right when it informed me to restart my computer the computer froze so i had to reboot.
Now it seems all the programs from a certain point on my nav bar on over will not open, nor will they open from their root location, these programs being Quark, Entourage, Word, Excel, Yahoo IM, Preview, iCal to name a few?
Any ideas what happened?

First try to repair disk permissions in the Disk Utility. If that doesn't help, you can try to reinstall the Security Update from the Downloads page.

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Thank you for using Apple Support Communities.
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