cienki77: mine wallet crushed too..

i repaired like that: copy file wallet.dat and bootstrap.dat.old  ---- then delet mintcoin wallet-----install new mintcoin wallet--- inport your wallet.dat  --- then change you copied file boostrap.dat.old into bootstrap.dat and copied in mincoin directory... then you have to wait to get sincronized..

if that helps...   it worked for me..