Start -> Select "Run" -> Type "Regedit" -> Select HKEY_LOCAL_MACHINE -> Select "SYSTEM" -> Select "CurrentControlSet" -> Select "Control" -> Select "Class" -> Select "{4D36E965-E325-11CE-BFC1-08002BE10318}"
**This folder is the DVD/CD-ROM Drive Class Description in the registry. Look for any of the following names in the right hand column.
* UpperFilters
* LowerFilters
* UpperFilters.bak
* LowerFilters.bak
**If any of the above keys shown in step 4 are listed, right-click on them and choose Delete
**After deleting the keys, close the Registry Editor.
**Reboot your computer
**Open My Computer and check to see if your CD or DVD drives have returned. You may also want to open Device Manager and verify that the yellow exclamation and error code on the CD or DVD drive is gone
**This folder is the DVD/CD-ROM Drive Class Description in the registry. Look for any of the following names in the right hand column.
* UpperFilters
* LowerFilters
* UpperFilters.bak
* LowerFilters.bak
**If any of the above keys shown in step 4 are listed, right-click on them and choose Delete
**After deleting the keys, close the Registry Editor.
**Reboot your computer
**Open My Computer and check to see if your CD or DVD drives have returned. You may also want to open Device Manager and verify that the yellow exclamation and error code on the CD or DVD drive is gone
