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.
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 (www.symantec.com).
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.
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 ▾
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.