What is nielsenonline.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the nielsenonline.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for nielsenonline.exe related errors

Nielsenonline.exe file information

Windows Task Manager with nielsenonline
Nielsenonline.exe process in Windows Task Manager

The process known as NielsenOnline belongs to software Nielsen or Nielsen//NetRatings or Nielsen Online by The Nielsen Company ( or NetRatings (

Description: Nielsenonline.exe is not essential for Windows and will often cause problems. The file nielsenonline.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 45,056 bytes (58% of all occurrences), 47,456 bytes and 4 more variants. 
It is not a Windows core file. The software starts upon Windows startup (see Registry key: MACHINE\Run). The program is not visible. The process listens for or sends data on open ports to a LAN or the Internet. Therefore the technical security rating is 51% dangerous, however you should also read the user reviews.

Uninstalling this variant: You have the option to uninstall the associated program (Start > Control Panel > Uninstall a Program > Nielsen or Nielsen//NetRatings).

Recommended: Identify nielsenonline.exe related errors

Important: Some malware camouflages itself as nielsenonline.exe. Therefore, you should check the nielsenonline.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

not much, but would be interested in becoming a member
  linda andrade  
how to remove it
Installed voluntarily and is very obvious about its purpose. Seems to have no adverse affect on my system whatsever and easily removeable using add/remove programs.
It's like TV Ratings system for internet traffic run by Nielson Group
  rizzn   (further information)
Installed if you sign-up for Nielsen consumer questionnaires
  Chris Archer   (further information)
computer pop up for closing
Some advertising thing that gives you lotsa spam/popups
NielsenOnline.exe is showing up twice in my Task Manager.
  John S. Matherne  
Caused conflict with audio card on a Compaq R4010US
  J Salaz  
It's a downloadable internet monitoring program
  Nielsen Online   (further information)
Survey service that I get paid to have running on my PC.
  Ken Fougere  
Pays you to allow them to collect information about your and your household's computer and Internet usage and activity
  Ken Fougere   (further information)
Used for Nielson Homesccan survey program
  Tony H.  
I was invited by them and am I member of AC Neilson Homescan. I want to have it on my computer and would like it to not pop my protector programs as dangerous.
  cinders818p   (further information)
Obtained from Neilsen when I joined them
As a Nielsen//NetRatings panelist, your browsing and buying habits influence the composition of the Internet as well as how companies conduct business. Members of the research panel help to shape the future of the Internet. , Members will automatically be entered into their Sweepstakes.
  Ken Fougère   (further information)
It is a self installed program that runs in the background to monitor internet usage. There is absolutely NOTHING dangerous about this program. I have had it on my computer for more than a year and it doesn't interfere with anything whatsoever. Plus they send me $5 every quarter just for letting it run in the background on my computer
leagal online information collector
  Werner Große   (further information)
it is a legitimate product that tracks your internet traffic it is only installed if you go looking for it and sign up with
  Caleb   (further information)
It is an information gathering program for a neilsen polls
  Frank Dunn   (further information)
Have used for years with no problems. Knew exactly what its purpose was before installing. Like points-for-gifts program that it has.
They pay me to monitor my internet activities.
  Ken Fougère   (further information)
voluntary participation in online consumer panel
  Cindy Henkel   (further information)
Installed this voluntarily. Does not cause slowdown, display ads or popups. Easily removed.
  Cue   (further information)
This lags my computer like hell.
Make PC very Slow but isnt dangerous
Virus detected by avg, danger level 4/5 Slows down PC and installs adware and potentially unwanted programs, is also spyware.
It records your inputs and monitor. Why would anyone willingly download this? They see everything you do, and can easily track your passwords to websites like amazon, paypal, email accounts. I suggest that you all remove this from your PC at once, and think twice before someone offers you $20 a year to watch everything you do on your PC.
  A Naylor  
Leaves something on your computer that frequently tries to use network resources even when uninstalled
It's a Backdoor/spyware to your computer that CAN allow them to install whatever/whenever they like, IF you're dumb enuff to expose your passwords/bank details for a $5 reward, go for it! I emailed them to explain it more and got NO REPLY!

Rating chart

Summary: Average user rating of nielsenonline.exe: based on 35 votes with 30 user comments. 2 users think nielsenonline.exe is essential for Windows or an installed application. 23 users think it's neither essential nor dangerous. 4 users suspect danger. 6 users think nielsenonline.exe is dangerous and recommend removing it. 3 users don't grade nielsenonline.exe ("not sure about it").

Do you have additional information?
What do you know about nielsenonline.exe:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving nielsenonline issues

A clean and tidy computer is the key requirement for avoiding problems with nielsenonline. 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.

To help you analyze the nielsenonline.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

nielsenonline.exe [all]