My Dock is gone on Mac. How do I reinstall?

my dock on mac not work. brother tried download new skin, deleted , it's gone. can't try change skin of dock in candy bar app.. where , how re-download/reinstall dock os x 10.6.8?

 

you put mac os x 10.6 snow leopard upgrade or grey restore dvd mac , reinstall mac os x, ****ed things back, , data not deleted, unless tell installer otherwise.

guess don't have backups?

 

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