This is my first post, hello everyone.
I have the exactly same problem with the same device.
Fresh copy of Windows XP didn't help, tried newer version of Nero over fresh Windows, didn't help. Checked IDE cable - working, updated to newest firmware, still the same.
When i used the DVD on another computer, he also couldn't read it. But when I burned another session, everything was ok, he was able to read both session from my NEC, and the newly written.
Im guessing that this is either nero issue, or writer doesn't write propertly lead in/out.
There is no problem with CD-s...
Please help someone!