How do I reinstall messages in os mountain lion ?

I previously attempted to use ichat prior to messages being part of mountain lion
when upgrading to mountain lion , it used all my contacts from ichat , but I am unable to send or recieve messages from macbook
I am also unable to add or delete contacts
any suggestions welcome ?

The issues you are having all point to data problems, not problems with the program itself. It is very rare to have an application get broken in virtually any way. Trying to re-install the application won't likely help.
Can you create a new account on your Mac and try to use Messages there. That will help determine if the problem is system-wide or isolated to your account.

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