You should dump your PRV key from the qt-wallet. In this case if your file/files are corrupted you can install the qt-wallet once again and import your PRV key.
Next time do it! Hope you will get back your coins.
EDIT:
Backup your directory from AppData/Roaming/ColossusCoinXT and what you can try is to run qt-wallet with command option -salvagewallet
-salvagewallet
Attempt to recover private keys from a corrupt wallet.dat on startup
If you got your prv key, delete AppData/Roaming/ColossusCoinXT. Run qt-wallet and import your prv key. When it sync to day when you move your coins you will see your coins back.