I've seen this exact problem this weekend, with NERO 6 on WinXP (I don't know which bit causes the problem).
The solution seemed to be to run the Nero CD/DVD Speed tests, then reboot the pc.
After rebooting, run Nero DriveSpeed, select the drive, select options and press 'detect'.
For some reason, this seems to correct the fault and allows reading and writing at the correct speeds.
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