I have used Bitcoin-QT to send all my bitcoins to a different address thinking I would send it back and everything will be normal but when I sent them back bitcoind shows twice the original balance. Is there a way to just delete all the balances in all my wallets without changing the private/public keys so they are still usable?
Free monies!
That is odd though. Can you try launching your bitcoin client using -rescan and see if the problem goes away?
As far as "all the balances" I'm not sure what you are referring to. Bitcoin calculates the balance based on the transactions in the blockchain for the addresses that you have in your wallet. So there's no "balances" stored by the client -- it is a calculated number.
Ok I will try that thanks.
List all the accounts and one or more will be in negative numbers
There isn't one with negative balance. 
