I had similar issues when a resync caused corruption issues. Try deleting everything apart the exe, the dll files and the wallet.dat if you have some xcn. You'll then need to do a search for cryptonite in the registry and delete any keys you find. I used regedit. I think the important one is the datadir key which seems to tell cryptonite to do a fresh install. You might also struggle connecting to any peers once it starts up so run 'addnode 206.72.193.148 add' from the console command line in cryptonite.