What is npwinext.dll?

Npwinext.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 Bing Bar.

Click to Run a Free Scan for npwinext.dll related errors

Npwinext.dll file information

The process known as Bing Bar or MSN® Toolbar belongs to software Bing Bar or MSN Toolbar by Microsoft (

Description: Npwinext.dll is not essential for Windows and will often cause problems. The npwinext.dll file is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 612,616 bytes (45% of all occurrences), 506,720 bytes and 10 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 d2ce3e00-f94a-4740-988e-03dc2f38c34f. The program has no visible window. The npwinext.dll file is able to monitor web browsers. The npwinext.dll file is digitally signed. There is no detailed description of this service. The file is not a Windows system file. Npwinext.dll is able to monitor applications. Therefore the technical security rating is 59% dangerous, however you should also read the user reviews.

Uninstalling this variant: If problems with Bing Toolbar come up, you could also do the following:

Recommended: Identify npwinext.dll related errors

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

browser extension toolbar for Internet Explorer and Firefox
  meehee   (further information)
Microsoft Toolbar for Internet Explorer
  meetoo   (further information)
Not for use and created a spoolsv.dll that downlaod waucl1.exe virus.

Summary: Average user rating of npwinext.dll: based on 3 votes with 3 user comments. 2 users think npwinext.dll is essential for Windows or an installed application. One user thinks npwinext.dll is dangerous and recommends removing it.

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Best practices for resolving npwinext issues

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

Other processes

npwinext.dll [all]