I just reinstalled windows, so the sugarchain wallet had to be reinstalled.
how to restore my previous wallet data, please help my friends ..
I have this file (sugar wallet backup.dat)
Its easy to restore the wallet. Just install your wallet. Once you open the wallet you have to set a path where the blockchain and the new wallet are stored. Once this folder is created you find a file named wallet.dat inside the folder. That's the new wallet. It has to be replaced by the backup. So to restore the old wallet just delete the new wallet (wallet.dat) and rename your wallet "backup.dat" into "wallet.dat" and put it into the folder.