How to Reinstall Cdrom.sys

Although you can’t technically reinstall your CD-ROM driver (cdrom.sys), you can reset it so that it re-detects your drives when you have a problem. Sometimes, you get a message saying that cdrom.sys was corrupted or missing, or you see an incomplete list of your CD/DVD drives on “My Computer.” Without using any third-party applications, you must make some changes to your registry to get cdrom.sys functioning again.

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Step

Press the key with a Windows icon and the “R” key on your keyboard simultaneously.

Step

Write “regedit” in the box and click “OK.”

Step

Browse to the following location in your registry using the left side of the window where you can expand folders: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}.

Step

Right-click “UpperFilters” on the right side of the window and click “Delete.” Click “Yes” when you get a confirmation prompt. Do the same for “LowerFilters.”

Step

Restart your computer.

Tips & Warnings

  • Exercise caution when editing your registry. Any mistake you make might reflect negatively on your system.