Core Apps Not Launching After Installing OS X Mavericks

I Installed OS X Mavericks about a week ago, It worked fine at first but all of a sudden no core Apps will load.

Mail, iCal, App Store, Maps, iMessage all quit and log a console message "Exited with Code 1"

I have tried: rebooting, resetting the NVRAM, and booting my OS in safe mode. None fix the problem.

I really don't know how to fix this without doing a clean install and wonder if anyone has a solution to this more narrow than reinstalling the OS cleanly?

I managed to fix the issue by reinstalling OS X Mavericks

Here's how to fix it

1. Restart your machine

2. On boot hold Command and R

3. Choose to Reinstall OS X

System will restart as usual after install and OS X will be fully functional

You will NOT lose any settings or personal data with this method

:)