What is NppBho.dll?

NppBho.dll is a browser extension for Internet Explorer. This add-on enables several additional functions for Internet Explorer. You can disable it through the Extras menu (key combination Alt + X) under Manage Add-ons. The following paragraph provides more information about NcoBHO.

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NppBho.dll file information

The process known as NcoBHO belongs to software Norton Confidential Browser or Norton Confidential or Norton Confidential Browser Component by Symantec (

Description: NppBho.dll is not essential for the Windows OS and causes relatively few problems. The file NppBho.dll is located in a subfolder of "C:\Program Files\Common Files". Known file sizes on Windows 10/8/7/XP are 97,960 bytes (28% of all occurrences), 96,936 bytes, 96,984 bytes, 97,696 bytes or 93,400 bytes. 
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include 1E8A6170-7264-4D0F-BEAE-D42A53123C75. The program is not visible. NppBho.dll is able to change the behavior of, or monitor Internet Explorer. The service has no detailed description. The file is not a Windows core file. The file is a Verisign signed file. The file is certified by a trustworthy company. The application can be uninstalled in the Control Panel. Therefore the technical security rating is 35% dangerous, however you should also read the user reviews.

Uninstalling this variant: You can also remove the entire program Norton Confidential Browser or Norton Confidential Browser Component using Windows Control Panel.

Recommended: Identify NppBho.dll related errors

Important: Some malware camouflages itself as NppBho.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the NppBho.dll process on your PC to see if it is a threat. If NcoBHO has changed your browser's search engine and start page, you can recover your browser's default settings as follows:

Reset default browser settings for Internet-Explorer ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


User Comments

not sure if its really used w/norton
Norton Confidential Browser Helper Object
Antiphishing, Web site verification and authentication, Personal password encryption.
    (further information)
This file causes IE7 to freeze up
  Carlyle MacHarg  

Summary: Average user rating of NppBho.dll: based on 5 votes with 4 user comments. 3 users think NppBho.dll is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. One user suspects danger. 2 users don't grade NppBho.dll ("not sure about it").

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Best practices for resolving NppBho issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active NppBho process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the NppBho.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

NppBho.dll [all]