Steps to restore sync with main chain and sync wallet balance with blockchain balance
(backup ur wallet.dat first!)

1. download latest wallet link can be found at https://bitcointalk.org/index.php?topic=580725
2. make sure u sync with correct chain (verify with blocknumber on wallet same as on https://chainz.cryptoid.info/dmd/ )
3. in case u on wrong chain download the presynced chain linked on first page of https://bitcointalk.org/index.php?topic=580725 and replace ur local chain  files with it
4. after wallet startup go to help - debug - console and execute the comand checkwallet and then repairwallet after a few minutes the fixed balance should be visible
5. if still issues u can try to start ur wallet in windows cmd  with the -rescan parameter this way the local wallet.dat  is getting in sync again with the transactions visible in local bchain