It looks like the database has been corrupted.The last time the .exe was running does it closed properly (File/Quit) of it has been forced to close?
Also, can you please navigate to C:\Users\username\AppData\Roaming\Qora and delete the data folder?
In case you have changed the location of data folder go where it is stored and delete it.
Then try to launch the app as normally.If it is launched successfully it will make a sync from scratch.

In case you do not want to sync from scratch, you can download the latest data folder from here http://qora.co.in/?datafolder and replace the existing data folder on your machine while the wallet is not running.