This error happens when your user account does not have access to the temporary folder created by EncryptDisc during either the encryption or decryption process. This can sometimes happen because antivirus programs are actively scanning the files as they are being created, which can cause EncryptDisc to be unable to decrypt the files to that folder. Waiting a few minutes can sometimes solve the issue, however we recommend consulting your antivirus provider for steps on adding exceptions for the staging folder, located at c:\users\%username%\documents\encryptx .