What is BHOManager.dll?

BHOManager.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 QuickTest Professional.

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BHOManager.dll file information

The process known as QuickTest Professional or Astra appears to belong to software QuickTest Professional or Astra or HP QuickTest Professional by Mercury Interactive ( or Hewlett-Packard Development Company, L.P (

Description: BHOManager.dll is not essential for the Windows OS and causes relatively few problems. BHOManager.dll is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 81,986 bytes (57% of all occurrences), 69,690 bytes or 77,890 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 474264BC-9571-47C1-85B9-780F756DC9CE. The program has no visible window. The BHOManager.dll file is able to change the behavior of, or monitor Internet Explorer. There is no detailed description of this service. The BHOManager.dll file is not a Windows system file. The BHOManager.dll file is an unknown file in the Windows folder. BHOManager.dll is able to monitor applications. BHOManager.dll appears to be a compressed file. Therefore the technical security rating is 74% dangerous.

Recommended: Identify BHOManager.dll related errors

If BHOManager.dll is located in a subfolder of C:\Windows, the security rating is 0% dangerous. The file size is 192,512 bytes. The program has no visible window. The application can be removed using the Control Panel's Add\Remove programs applet. User opinion: not dangerous BHOManager.dll is able to change the behavior of, or monitor Internet Explorer. There is no detailed description of this service. BHOManager.dll is not a Windows core file. BHOManager.dll is able to monitor applications.

Uninstalling this variant: If you still experience problems with BHOManager.dll, you can uninstall HP QuickTest Professional from your computer using the Control Panel applet Uninstall a Program.

External information from Tony Klein:

Important: Some malware camouflages itself as BHOManager.dll. Therefore, you should check the BHOManager.dll process on your PC to see if it is a threat. If QuickTest Professional 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

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Best practices for resolving BHOManager issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active BHOManager process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the BHOManager.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.

Other processes

BHOManager.dll [all]