My -necdvd-rw nd-3550A DVD/CD RW drive - wont burn dvd but it reconizes the blank dvd as a cd any ideas please as i am stumped i have rebuilt the computer and it is the drive from my old one it reconizes the dvd drive when it is empty but when i insert a blank dvd-r disk it just shows a cd drive my OS is windows xp home edition service pack 2