Type %appdata% into your search and click on roaming>IXCOIN   then rename your wallet.dat to something like wallet.dat1234 so it regenerates a new empty wallet.dat when you close down the executables.Then try syncing up your wallet with zero balance.If it works or doesnt you still can go back and remove/delete the new wallet.dat and rename the one you renamed wallet.dat1234 or whatever back to just wallet.dat to have balance reappear.

Make a back up and save private key if you want using dumpprivkey command in console