Perhaps a bit late to reply to this topic, but what the hey. Here's a thought: I extracted a .RAR file with 7-zip (portable version) and got the "CRC failed etc." error too. But as the original file had been split into four seperate .RAR files, I then tried to extract those four .RAR files in one batch. No error message this time, all the extracted files got combined into the original file. Is this helpful at all ?