Registry settings used by iTunes drivers for importing and burning CDs are missing

The letter on my DVD R/W drive, without any known reason, changes names from my E drive to now being my G drive.
Around the same time, when opening iTunes, I recieved the problem message that is attached to this question in CD Problem.docx.
At the Apple Help site I was directed to do two things. One, to completely remove iTunes which I did to no effect. Two, manually  install the device filter in the Windows registry. I went through all the steps to do this only to find out that the device filter, GEARAspiWDM was already in place and all alone.
A couple other observations. I can play and burn music from and to the G drive using Windows Media Player.
If I try to play a music CD using ITunes I get the same attached message, but when I click OK on that message, iTunes will play the CD in the G drime.
When I put a CD in the G drive I can access the contents of the CD via Computer.
The Device Manager reports that the G drive is working  properly.
I have changed the G drive letter back to E using the Change, add, or remove a drive letter steps from the Microsoft site but that didn't do any good so I changed it back to G.
So, the problem is twofold: my DVD R/W drive's letter title has changed from E to G.
I cannot burn CD's from iTunes because of "missing registry" settings which really don't appear to be missing. CD-Problem.docx