If you have “lost” all your optical drives (CD/DVD/Bluray/HD-DVD or any emulators), e.g. it doesn’t show up in Windows Explorer, check if Device Manager reports registry problems.
If in fact, that seems to be the problem, follow Microsoft’s guidelines, quoted below, to restore your drives:
- Start Regedit
- Browse to this key (that is one line):
- Look for any entries labeled UpperFilters or LowerFilters. If either of those exists, delete them.
- Reboot, and open Windows Explorer to see if your drive(s) has reappeared.
Device Manager should report no problems now.