Most antivirus programs classify NHelper.dll as a harmful extension to Internet Explorer: e.g. Adware_BHO_NavExcel or Mal_Naix-6 (detected by TrendMicro), and BrowserModifier:Win32/NavExcel (detected by Microsoft). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated Web Navigation Made Easy software, it's no surprise. In most cases, this kind of adware is installed on the side when you install a freeware product like a Youtube Downloader or a PDF Converter. In the following selection, you can read more about Web Navigation Made Easy and how to get rid of it.
Description: NHelper.dll is not essential for Windows and will often cause problems. The NHelper.dll file is located in a subfolder of "C:\Program Files" (generally C:\Program Files\navexcel\navhelper\v2.0.4d\).
Known file sizes on Windows 10/8/7/XP are 135,168 bytes (80% of all occurrences) or 151,552 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 C1E58A84-95B3-4630-B8C2-D06B77B7A0FC. The program has no visible window. The file is able to monitor web browsers. There is no detailed description of this service. The file is not a Windows core file. NHelper.dll is able to record keyboard and mouse inputs. Therefore the technical security rating is 66% dangerous, however you should also read the user reviews.
Recommended: Identify NHelper.dll related errors
External information from Tony Klein:
Important: You should check the NHelper.dll process on your PC to see if it is a threat. If Web Navigation Made Easy 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 NHelper process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the NHelper.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.