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Restore Missing CD or DVD Drive

Procedure:
1.Click Start->Run->type Regedit

2.Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class
Key Name: {4D36E965-E325-11CE-BFC1-08002BE10318}

3.Value Data: [Delete All Value Data from UpperFilters and LowerFilters]

4.Exit Registry and Reboot

Note: Do not delete the Key or the Multi-String Values. Delete only the data values.
Reports have filtered in that CD or DVD drives will suddenly cease to exist in XP systems. Most often this has been reported in conjunction with program installations and Windows upgrades, but it has also happened for no apparent reason. This tweak will restore the missing drives after a reboot.

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