Client = software which uses block chain and wallet file to display your balance, allow you to send/receive funds.
Blockchain = public record of balances
wallet (wallet.dat) = private secret (only you should know) file which contains the keys which control access to your funds.
Uninstalling client, and deleting the blockchain accomplish nothing.
Deleting the wallet.dat will cause client to create a new one.
Reading the instruction manual(the wiki) would go a long way also
After all it's money we're talking about, not the latest videogame.