I have an HP Pavilion with an NEC DVD+RW ND-2100AD drive. It can detect CD's, blank CD-R, DVDs with movies, but not blank DVD's. Can the problem be software, hardware related, or DVD related. I have purchased DVD+R & DVD+RW's but it does not detect them. The software I am using is InterVideo DVD Creator and Sonic RecordNow! I have tried the PC Doctor and it says the DVD works fine, but the softwares mentioned above tell me that there is no DVD Rewritable found on my system.