What is NavShExt.dll?

NavShExt.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 Norton AntiVirusNAVShellExt Module.

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NavShExt.dll file information

The process known as Norton AntiVirusNAVShellExt Module or Norton AntiVirus Shell Extension Module or Symantec Shared Component Shell Extension Module belongs to software Norton AntiVirus (version 2004, 2006, 2002, 2005, 2003) or Symantec Shared Component or Norton Internet Security (version 2005) or Norton SystemWorks (version 2004) or SPBBC by Symantec (

Description: NavShExt.dll is not essential for Windows and will often cause problems. NavShExt.dll is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of C:\—common is C:\Program Files\Norton AntiVirus\ or C:\Program Files\Norton SystemWorks\Norton AntiVirus\. Known file sizes on Windows 10/8/7/XP are 218,736 bytes (25% of all occurrences), 140,912 bytes and 20 more variants. 
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 BDF3E430-B101-42AD-A544-FADC6B084872 or A8F38D8D-E480-4D52-B7A2-731BB6995FDD. The program has no visible window. NavShExt.dll is not a Windows core file. The NavShExt.dll file is a Verisign signed file. The file is digitally signed. The file is able to change the behavior of, or monitor Internet Explorer. Therefore the technical security rating is 33% dangerous, however you should also read the user reviews.

Uninstalling this variant: In case of problems with NavShExt.dll, you could also do the following:
  • visit the support page
  • search for an update on the vendor’s website
  • safely remove the program using the uninstall program of Norton AntiVirus (Control Panel ⇒ Uninstall a Program)

Recommended: Identify NavShExt.dll related errors

External information from Tony Klein:

Important: Some malware camouflages itself as NavShExt.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the NavShExt.dll process on your PC to see if it is a threat. If Norton AntiVirusNAVShellExt Module 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

it is a copy, it belongs to come other company not of norton, sumthing BBSGDN or sumthing when removed.
It is part of Norton anti-virus and is also considered adware. Also, A lot of people tend to run to firefox/moxilla. I disagree. While it may be safer in terms of getting attacked it doesn't open everything either. So what then?? Don't mask the problem. FIX IT. Good protecion prevents these problems and keeps your IE working fine.
I had Norton Antivirus on my computer but found it caused my computer to slow and my mouse to freeze. It completes with you for CPU time. So I decided to uninstall it but didn't use the original software to do that. The software I used left a lot of components on my computer and these caused many errors and freezeups. If anyone uninstalls Norton, I suggest they use the uninstall on the original uninstall disk.
  Bob Mckinnon  
It's related to Norton AV
  Buggy Woogy  
its anoying pops up as you start the net, click ok and it goes away
Comes with Norton Antivirus
  Vampire Heart  
it was infected with adware.blockchecker could have been part of norton but norton isnt used anymore
Part Of Norton. Completely Safe
  Gabriel Vartanian  
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of NavShExt.dll: based on 35 votes with 9 reviews. 18 users think NavShExt.dll is essential for Windows or an installed application. 7 users think it's neither essential nor dangerous. 5 users suspect danger. 5 users think NavShExt.dll is dangerous and recommend removing it. 5 users don't grade NavShExt.dll ("not sure about it").

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Best practices for resolving NavShExt issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active NavShExt process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the NavShExt.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 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

NavShExt.dll [all]