I have been using both Decrypter and ImgBurn on two computers, my old and my new one with no problems or errors, except for the CRC on bad disks. I installed the new Nero 7 and am now coming up with the unable to lock volume for exlusive access error and then it states "incorrect function". I have unchecked the box in iso write settings and it works fine. I have checked and cannot find anything that has a handle on the the drives, because this has occurred on all three of my drives, NEC1300a USB, Plextor716UF and HP640c. Since this is new error for me I was wondering if it really makes a difference if the box is left unchecked, the burned movies plays fine. And if anyone else has any ideas why this occuring.