Grr try copying stuffs from other cds or dvds. If it gets copied without any issues then the problem is with the cd else the problem can be a faulty cd/dvd writer or the problem can be the data bus which connects the cd/dvd writer.
If the problem is with the cd and since Isobuster cant read it just throw it away coz if isobuster cant then nobody can. I guess the burn process was unsuccessful.
If the problem is other then you better call the tech support guys.