How to Fix the Lower Filters on a Windows XP CD-ROM
When discussing a program as complex as a computer operating system, bugs and other glitches come with the territory. One bug seen in versions of Windows XP, known as the "Lower Filters" bug, causes the machine to fail to recognize your CD or DVD-ROM. Fixing this requires that you manually navigate through and edit the registry, which is the storehouse for all important variables relating to your operating system.
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Instructions
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Open the "Start" menu, click on the "Run" button, type in "Regedit," and press "Enter."
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Open the following folders in order: "HKEY_LOCAL_MACHINE," "SYSTEM," "CurrentControlSet," "Control," "Class," "{4D36E965-E325-11CE-BFC1-08002BE10318}."
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Click on the "UpperFilters" option located in the right-hand pane and select "Delete" from the "Edit" menu.
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Click on the "LowerFilters" option located in the right-hand pane and select "Delete" from the "Edit" menu.
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Close the registry editor and restart the computer.
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