Since you are missing Blank CD, take a look again. Are some others missing? Maybe, maybe not. But that fact that one is missing indicates a similar problem that I had. So I'll just tell you what I did to fix it, and maybe it'll help you.
I did all the other reg changes, used all the utilities I could find on the net and nothing worked. I tried TweakUI, AutoPlayRepair, Auto Fix, Clean Handlers, the upper and lower filters thing. I always used System Restore before each one. When they didn't work, I uninstalled them and used my restore point to start over again. Some of the utilities like Tweak UI, helped me delete some old burning software that was in the list to choose from, but none of the utilities would let me add back the Blank CD and DVD Movie categories that were missing in my combo CD-DVD burner. Also, when I looked at the drives in My Computer, my DVD-CDRW just said CDRom.
I finally found a forum post in Google that pointed me here.http://support.microsoft.com/default.aspx?...kb;en-us;330135
It talks about Roxio, which I don't use, but I read on. My fix was using #3 and #4. I'm betting it was #4 that really fixed me because I'd already made the changes earlier that are described in #3. Once I applied the changes to Winlogon in #4,
I got my missing Blank CD and Video movie back in my drop down selections and my drives now appear and work as they should. Also, my combo DVD-CDRW no longer says CDrom in My Computer. My disks were readable again too.
This fixed everything for me. That was two months ago and my drives are still working properly.
Just be sure to make a System Restore Point and/or backup your registry first...just to be on the safe side.