WinPcap, Wireshark upgrade message

November 4, 2009

When upgrading Wireshark (a Network Protocol Analyzer, formerly known as Ethereal) and WinPcap, a message appeared:

System Information
Operating system detected on registry: Windows vista - x86
True operating system (kernel.dll): Windows Vista - x86
npptools.dll present on the system:    false
netnm.inf present on the system:       false
nmnt.sys present on the system:        false

This message is normal.

npptools.dll, netnm.inf and nmnt.sys are components of Microsoft’s Network Monitor (netmon) utility. Netmon is a network traffic capture and protocol analysis utility, similar to Wireshark.

Code 41

May 3, 2009

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)


  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“.