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.

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

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

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}.

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.”

Restart your computer.


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

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About the Author

Mikhail Polenin has been working with computers since 1997. His experience also expands to astrophysics, masonry, electricity and general appliance repair. He's written about various different subjects regarding astrophysics and electrical circuits for various online publications. Polenin attended the New World School of the Arts and the University of Florida.