How do I re-install this update? Something went wrong during it and now I can't FaceTime or iMessag

How do i re-install the maverick update?

Download the 10.9.3 combo update from the Apple Downloads site.
http://support.apple.com/kb/DL1746
Or, reinstall by using the Recovery HD.
http://support.apple.com/kb/ht4718

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