I'm having the same trouble, dell latitude. I could get it to burn CD's, though it produced a coaster once, with burn proof on no less! i still cannot get it to do DVD writing. It reads them fine though. Thinking this may have something to do with usb1.1 throughput (from the laptop usbports) i bought a firewire pcmcia card, and am having exactly the same problem.
any luck with yours?