Here you can look how to update or reinstall a Coin Wallet
for Example i used Chillicoin wallet !
First you go to your Wallet files foulder , location
In this foulder you find the Wallet.dat ! This file we need , so be sure you dont delete it or lost it because in this file are your coins saved from your wallet ! When you have saved this file and you will reinstall the Wallet you can now delete the Foulder ! Install or Run now your wallet again and insert your saved Wallet.dat in there !
If you want to update your wallet for a new Version of the Wallet you only insert the wallet.dat in the new foulder from the Wallet !
Run it , finish !