Recently re-installed XP and now notice that I have lost 'Simulation' and 'Buffer Underrun' from my Nero options. I removed Nero with the clean up tool and re-installed to the latest versions of Nero 6, to no avail. My burner Firmware is up to date and I did not have the problem before re-installing XP. The top image is from Nero Help, the lower image is my actual settings.