Can't open Finder or keychain access after last Yosemite update

I have a new Mac (2) number and I cannot open Finder, Keychain access, and several other programs from my Dock or Applications since the last update

Hi ..
Might be corrupted Dock preferences.
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following:
~/Library/Preferences/com.apple.dock.plist
Click Go then move the com.apple.dock.plist file to the Trash.
Restart your Mac then see if you can open the Finder and other apps from the Dock.

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