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.

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

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 also uses the file name protector.dll, for example Win32:BHO-AOD [Trj] (detected by Avast), and not-a-virus:AdWare.Win32.GoonSearch.a (detected by Kaspersky). Therefore, you should check the protector.dll process on your PC to see if it is a threat. If bProtector 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

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").

Do you have additional information? Help other users!
What do you know about protector.dll:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving protector issues

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

protector.dll [all]