Software update hung, now Apps won't work

first the specifics:
I have a MacPro:
Version 10.6.2 for OSX

I did the latest update that showed for Safari. It went to reboot and just sat there and hung. I waited for 10 minutes, then manually restarted the Mac. It came up, but then when I went to open Mail, I got an error that it couldn't open. I then clicked on ok, and tried to open another app, and it wouldn't open. I tried with several apps with the same result.

I downloaded the MacOSXUpdCombo10.6.2.dmg and ran it with no problems, and the Apps will still not open.

Any idea's?

 

The only app that seems to work at this point is my firefox, which makes it real weird.