Can't open Calendar/Preview/App Store in OSX Yosemite

So this weird thing happens that none of my system apps could be opened...
I tried to restore my system but when I hit that cmd + R it appears a lock icon and it seems to require a passcode, I tried my login passcode but it comes with no response...didn't really know how to fix it and its getting on my nerves
Anything would help. Thanks!

First attempt a clean install...
http://mashable.com/2013/10/23/clean-install-os-x-mavericks/
If this doesn't work, which it didn't in my case, then download
Pacifist.
http://www.charlessoft.com/
You will need a copy of the Maverick installer.
Use Pacificst to " Open Apple Intallers"
The go to Contents of Mavericks->Contents of EssentialSystemSoftware->Contents of Essentials.pkg->Applications
Then Click on the programs that don't seem to be working and insall. This helped me update certain applications that weren't working such as App Store, Font Book, Mail, and any others.

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