I suppose that re-install multibit and copy my wallet.dat in the appdata folder doesn't work...correct?
Because that link doesn't seem so easy
I don't have any experience with multibit (and only a very limited amount of experience with multibit HD), however, it's worth a shot...
As long as you keep a clean copy of your wallet in a safe place, and use a copy of this copy to place in the multibit appdata folder, it could do no harm (AFAIK). If it doesn't work, you still have the clean copy in the safe place to try decoding your wallet.
well, i think i'll give it a try.
Just a last question...is possible to sign a transaction sending 0 satoshi?
Why would you do that?