I get an error like "CRC failed in the encrypted file (wrong password ?)"!
RAR cannot distinguish a corrupt file and wrong password. If it were possible, it would make encryption weaker. Therefore, such a message may indicate both a wrong password and a corrupt file.
Check to see if you have installed the recent version. If not, please download the actual WinRAR/RAR version here
http://www.win-rar.com/index.php?aid=download. We always improve all functions with every update.