Code 41

Symptom (as seen on XP SP3): Kingston DTSecure Privacy USB Device appears as a single drive letter (such as L:) and attempts to  open the drive fail (with conditions such as “insert disk in drive L:”). Hardware properties shows an exclamation mark and the condition:

Windows successfully loaded the device driver for this hardware but cannot find the hardware device. (Code 41)

Workaround:

1. Edit the registry settings under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
2. Delete (or rename) the UpperFilters and LowerFilters values.
3. Restart.

This is not a Kingston issue. Similar problems are seen with other plug and play devices. See the Microsoft Knowledge Base article “Your CD drive or DVD drive is missing or is not recognized by Windows or other programs“.