A cd-rw doesn't need any software to read disks. The supplied software (Nero Express) is only needed for writing. Is the drive listed in My Computer. If it is, then I can't see any reason why it cant't read the disks you put in it. The most common problem is a faulty or incorrectly fitted cable, but you say that it reads the disk if you boott the computer with the supplied disk in the drive, so I'm baffled. Is it possibly that it isn't reading a disk written on another machine but is ok on commercially made disks?