Try this method, do the same thing but instead of finishing the downloaded files. Erased all the files in the 42 coin directory under local user . Copy the wallet.dat file and reopen the wallet. If that don't work, then what is the size of the file wallet.dat and if it's more then 1kbyte open it with notepad and search for your wallet address ..you'll might find some interesting things in your wallet.dat file using notepad!! If it's under 1kbyte then it's corrupted