The Bitcoins are still on the adress 1Fy1AwqEkXesQAuuzX8LXpiR9UU4xTwDV9 , so you could export the private keys and import them somewhere else (like a Blockchain.info wallet
https://blockchain.info/de/wallet/ ).
When all your Bitcoins are at the other wallet, you could reinstall the client to fix the mess and send the coins to your fixed client.
Here is a guide to export the keys from Multibit:
https://multibit.org/help_exportingPrivateKeys.htmlThere may be easier ways to do so, but I'm sure this would work.