DVD drive not working error code 19

My Dvd drive has stopped working. It is a read only drive.  Samsung SD-616T.  I get error message 19 "Your registry might be corrupted". I am not sure when it happened, I have downloaded Realplayer and Quicktime recently. I have tried uninstalling and reinstalling the device. I can't go back to a previous registry setting because system restore was turned off. It is now on turned on. I have seen repairs that require a registry edit. I went to the suggested  key HKLM \ system \ currentcontrolset \ control \ class \ {4D36E965-E325-11CE-BFC1-08002BE10318} and saw the  lower filter listed. A copy of the registry is shown under "code snippet". I believe that deleting this value will effect the repair. I would like confirmation of this. I would like a step by step instructions on how to do this. How to back up the registry. How to delete the value. I have not done a regedit before. Thank you for your help.

HKLM \ system \ currentcontrolset \ control \ class \ {4D36E965-E325-11CE-BFC1-08002BE10318} \ UpperFilters and LowerFilters and the
 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
 
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}]
"Class"="CDROM"
@="DVD/CD-ROM drives"
"EnumPropPages32"="MmSys.Cpl,MediaPropPageProvider"
"Installer32"="storprop.dll,DvdClassInstaller"
"SilentInstall"="1"
"NoInstallClass"="1"
"TroubleShooter-0"="hcp://help/tshoot/tsdrive.htm"
"Icon"="-51"
"LowerFilters"=hex(7):41,00,66,00,63,00,00,00,00,00,50,00,78,00,48,00,65,00,6c,\
  00,70,00,32,00,30,00,00,00,00,00
 
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}\0000]
"EnumPropPages32"="storprop.dll,DvdPropPageProvider"
"InfPath"="cdrom.inf"
"InfSection"="cdrom_install"
"ProviderName"="Microsoft"
"DriverDateData"=hex:00,80,62,c5,c0,01,c1,01
"DriverDate"="7-1-2001"
"DriverVersion"="5.1.2535.0"
"MatchingDeviceId"="gencdrom"
"DriverDesc"="CD-ROM Drive"

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