I know it is a tad late, but you really should have a back up of your wallet.dat and may be even have your coins spread out between two different clients.
Don't panic and try to recover your wallet.dat with pywallet first. It usually works.
-salvagewallet is a parameter you type when you start pywallet.
ok but i dont understand how work py wallet .. i dowland python 2,7 and after i dowlanded pywallet now what i have to do for try restore wallet.dat ?