Trouble Burning DVDs

Hello,
I have some old video cam tapes that I converted and am trying to burn them to DVDs - eventually I'd like to take old 8mm movies and do the same. The video conversion went ok however, ran into a glitch.

I am trying to burn the files onto DVDs w/Roxio Creator 2010 and it will not recognize the drive. My computer is an older one - HP Pavilion a1250n with AMD 64 Athlon x2 processor. The writeable drive is HP DVDRW DL and I am using DVD-Rs and DVD-RWs - won't recognize either disks. Burning audio and data files to CD-R & CD-RWs works fine. Thought since it said Lightscribe DVD+ Writer/CD-Writer - I was good to go but it's not. Someone - please help!!