The driver is somthing that MS should put in the os and have it right. I have two computers and only one of them do this. They boath have HP Light scribe dvd's in them. I am using 64 bit on boath. So I see it as a bug. I still have never got any updates on Windows 7 yet. The only thing they have up dated is the definations .
Don't forget, it's only a Beta 1 release. Not all hardware is going to be handled in a Beta. The final release will have a lot more hardware support. Did you try the DVD manufacturer's site, or Guru3d? Also try a Vista Driver and use the Vista compatibility option for the driver setup.