1. Throw away the corrupt file or program and empty the Trash folder.
2. Download the program or file again if you got it off of the Internet. If you got the program or file off of a disc or have a backup copy, insert the disc or other device the backup is stored on into your Mac.

3. Reinstall the program onto your Mac from a download or disk. If the error code 39 was attached to a file, copy the file back on to your computer from a disc or other storage device once the corrupted file has been thrown out.
4. Open the reinstalled program or restored file on your Mac. It should be free of any error as long as it is not corrupt.