I have been struggling, it seems after installing Service Pack 2 XP, with dvd burning with Nero 6. I kept getting calibration error and until now I've been stumped. For me I have been stumped and this is what worked for me: Control Panel--Administrative tools---Services. Go to IMAPI CD Burning Com Service. Click on that and go to Start up Type and choose "disable" from the drop down menu. Don't forget to apply. I am once again burning DVD's with NO MORE errors!!