Look into C:\Users\---USERNAME---\AppData\Roaming\Zcash\chainstate\LOG

You'll see smth. like this:

2017/12/30-22:59:59.000625 770 Recovering log #816
2017/12/30-22:59:59.000672 770 C:\Users\---USERNAME---\AppData\Roaming\Zcash\chainstate/000816.log: dropping 10483520 bytes; Corruption: error in middle of record

In following case delete 000816.log and restart zcash4win