Problem
This problem is usually caused by the Sonic Record Now software. It adds a couple of registry entries that cause the CD / DVD drive(s) to disappear from explorer.
Resolution
You need to remove the upper and lower filters of your cd reg
key.
1. Start > Run.
2. regedit
3. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class
and select {4D36E965-E325-11CE-BFC1-08002BE10318)
4. Select File > Export
5. save the file to the Desktop in case you need to restore it
6. In the right panel of the Registry Editor, select the
LowerFilters line, and then choose Edit > Delete. Click Yes in the
Confirm Key Delete dialog box.
7. Do the same for the UpperFilters line
8. Close the Registry Editor.
9. Restart Windows.
If this helped you fix your problem, Please email me and tell me about it.