reply to JSJJJ
Re: [WIN8] Windows 8 / CD-DVD driver issue One or both of those entries may be invalid.
Can you check the C:\Windows\System32\drivers folder and see if either PxHlpa64.sys or GEARAspiWDM.sys exist in that folder.
If either or both are missing from the C:\Windows\System32\drivers folder remove the corresponding registry entry.
If PxHlpa64.sys is missing then double-click LowerFilters and remove PxHlpa64 > OK
If GEARAspiWDM.sys is missing then double-click UpperFilters and remove GEARAspiWDM > OK
Create a system restore point beforehand and restart the computer afterward.