Plextor 24/10/40A: Problems with Nero, verification failure

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I've got a new Plextor 24x/10x/40x. I've installed Nero 5.5.7.2,
Easy CD Creator Deluxe 4 (which I've upgraded to 4.05), and
CDRWin 4.0a.
CDRWin doesn't recognize my burner at all.
When I use Nero to burn a Data CD, I get always get verification
failures (CRC errors on the files). However, when I use
Easy CD Creator 4, I NEVER get any CRC errors on the files I
write. I burn in the same speed and on the same media.
I also have Windows ME.
Does this sound like a hardware or software problem?