What is MSNLNamespaceMgr.dll?

MSNLNamespaceMgr.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. The following information can help you determine if MSNLNamespaceMgr.dll is a Windows system file or if it belongs to an application that you can trust.

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MSNLNamespaceMgr.dll file information

The process known as Windows Search Namespace Manager or Windows Desktop Search Namespace Manager belongs to software Windows Search or Microsoft Windows Operating System or B6200 (version B6300 Series PCL6) or CSC-ENG-MESPREREQC or Mentor Graphics CAMCAD or Microsoft Windows SDK for Windows (version 7) or SolidWorks (version 2009 SP03) or Verizon Media Manager by Microsoft (

Description: MSNLNamespaceMgr.dll is not essential for Windows and will often cause problems. The file MSNLNamespaceMgr.dll is located in a subfolder of "C:\Program Files (x86)" or sometimes in a subfolder of the user's "Documents" folder or in a subfolder of "C:\Program Files\Common Files" (common is C:\Program Files (x86)\Windows Desktop Search\). Known file sizes on Windows 10/8/7/XP are 304,128 bytes (98% of all occurrences), 233,472 bytes, 294,400 bytes, 365,568 bytes or 293,888 bytes. 
This is a special .dll file (Dynamic Link Library), which starts automatically when programs are launched. So it can monitor or manipulate all of your program starts. The program has no visible window. The service has no detailed description. The MSNLNamespaceMgr.dll file is not a Windows core file. It monitors program starts. Therefore the technical security rating is 65% dangerous; however you should also read the user reviews.

Uninstalling this variant: In case you experience problems using MSNLNamespaceMgr.dll, you can do the following:

Recommended: Identify MSNLNamespaceMgr.dll related errors

Important: Some malware camouflages itself as MSNLNamespaceMgr.dll. Therefore, you should check the MSNLNamespaceMgr.dll 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

Another MS Not Necessary/Overkill process. Might be needed in a network/company installation. Not relevant for single users
  PC the IT  
The MSN Toolbar is a browser toolbar for Internet Explorer that aims to enhance browsing and searching the web. It blocks pop-ups, highlights search terms on the page, and provides one-click access to other MSN services like Messenger and Hotmail.
Causing search engine links to send me to sites that are not the site described. Not a Windows file!
  R Miller  
it was running my browser and freezing my avast internet security
D:\Archivos de programa\Windows Desktop Search\MSNLNamespaceMgr.dll
  Ruben Contreras  
I am the only user of this comuputer. This started poping up after I have loged in, and I have been reading some of my event logs and some real strange dates have been loged like : 1969, 2033, 2099 ect.
MS claims Windows Search is designed to protect your and your company's sensitive data and personal information while helping you to find exactly what you need from your e-mail messages
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of MSNLNamespaceMgr.dll: based on 21 votes with 9 reviews. 5 users think MSNLNamespaceMgr.dll is essential for Windows or an installed application. One user thinks it's probably harmless. 4 users think it's neither essential nor dangerous. 6 users suspect danger. 5 users think MSNLNamespaceMgr.dll is dangerous and recommend removing it. 4 users don't grade MSNLNamespaceMgr.dll ("not sure about it").

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Best practices for resolving MSNLNamespaceMgr issues

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

MSNLNamespaceMgr.dll [all]