Did you check the log file? You might get something from the log file.
Kindly,
MZ
Private keys aren't put in the log file. The OP needs a wallet, wallet backup or private key backup.
I know that.
I told him to check in logfile as there might be some info about the last works in multibit.
Do like this, you may get it:
Go to roaming, multibit, multibit data : you can see roll key backup or something like that( I don't remember the name correctly ) .
Kindly,
MZ