The only software changes that I recall making are Windows Updates on a weekly basis.
This issue has been going on for months, and it's annoying to have an internal CD/DVD Drive that does not work, therefore recently I decided to contact the Microsoft Community to see if they could resolve the problem for me.
Up till now I have had to attach a Dell DW316 External USB DVDRW Drive, insert a DVD and erase the disc using Roxio. Then I can create a System Repair Disc because the drive is recognised.
I note that the "Create a System Repair Disc" option is part of "Backup and Restore (Windows 7)", could that be part of the problem?
I am going to be away from home for a few days now, but will take the M4800 with me, however the speed at which I respond to any of your queries will depend on Internet availability.
Regards
organcd