I have happily used Nero Burning Rom and CloneCD for all my burning needs for as long as I've had Windows XP. Now all of a sudden I am unable to burn anything at all. In CloneCD, I get a message that says "Writing to CD failed, MEDIUM ERROR: NO ADDITIONAL SENSE INFORMATION (3:0x64:0xc0)" and in Nero I get error message "Medium speed error. Invalid writestate. Could not perform EndTrack." I have an AOpen CRW1232 CDRW drive that has never failed to work properly and I've tried all different speeds from 1x to max. Could it be faulty CD-Rs? I've tried different CD-Rs but they are the same brand and from the same pack. I don't have another brand of CD-R right now, but I've successfully used CD-Rs from this pack before. I recently installed Norton Systemworks 2002, and I've disabled Anti-Virus and all other resident programs. I have been using Adaptec's ASPI 4.7 drivers before this problem occured.