The previous owner of my MacBook Air seems to have deleted my game center application. Is there any way I can get that back?

  • You're using the same installed system as when a previous owner had it?!? Can we spell key-logger? NEVER use a second hand machine without wiping it first. – Tetsujin Nov 29 '14 at 20:27

Try reinstalling OS X from the Recovery Partition. Turn off your computer, hold down Command and R while you turn it on again, and then go through the Reinstall OS X process. Apple Support has an article about it here.

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