What is protector.dll?

Protector.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 protector.dll is a Windows system file or if it belongs to an application that you can trust.

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Protector.dll file information

The process known as bProtector or API Guard appears to belong to software bProtector or Tenebril Protector by Performersoft or bProtector or Tenebril (

Description: Protector.dll is not essential for Windows and will often cause problems. The protector.dll file is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 790,520 bytes (64% of all occurrences), 748,544 bytes and 5 more variants. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The program has no visible window. The protector.dll file is certified by a trustworthy company. The service has no detailed description. It can change the behavior of other programs or manipulate other programs. The file is not a Windows core file. There is no description of the program. The process is loaded during the Windows boot process (see Registry key: AppInit_DLLs). Protector.dll is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 82% dangerous, however you should also read the user reviews.

Recommended: Identify protector.dll related errors

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

This has been identifed as part of the Trenebil Protector software as well as malware
trying to control computer
It changes the . system programs automatically.
Behindert das Starten der ( Norton-I) NIS2012-Oberfläche und führt zu Fehlern bei der Speicheradressierung mit Fehlermeldungen des Norton-NPE; ob löschen der protector.dll-Datei ausreicht kann ich bisher noch nicht beurteilen!
  Heinz-Ulrich Probst  
läßt Oberfläche von NIS-2012 nicht starten und führt bei Einsatz des NPE zu einem Speicherzugriffsfehler
  Heinz-Ulrich Probst  

Summary: Average user rating of protector.dll: based on 2 votes with 5 user comments. 2 users think protector.dll is dangerous and recommend removing it. 3 users don't grade protector.dll ("not sure about it").

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Best practices for resolving protector issues

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

To help you analyze the protector.dll process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

protector.dll [all]