Fix, Download, and Update Atcuf32.dll

Last Updated: 07/04/2022
[Average Read Time: 4.5 minutes]

Bitdefender Active Threat Control Usermode Filter files, such as atcuf32.dll, are considered a type of Win32 DLL (Dynamic link library) file. They are associated with the DLL file extension, developed by Bitdefender for Bitdefender® ATC.

Atcuf32.dll was initially released with BitDefender on 12/03/2018 for the Windows 10 Operating System. According to our records, this is the primary and most recent file release from Bitdefender.

Please see below for more detailed information, DLL file troubleshooting instructions, and free downloads of different versions of atcuf32.dll.

File Analysis Provided by Jason Geater (Author)

Recommended Download: Fix atcuf32.dll / BitDefender-related registry issues with WinThruster.

Compatible with Windows 10, 8, 7, Vista, XP and 2000

Average User Rating


Optional Offer for WinThruster by Solvusoft
| EULA | Privacy Policy | Terms | Uninstall

File Overview

General Information
File Name: atcuf32.dll
File Extension: DLL file extension
Description: Bitdefender Active Threat Control Usermode Filter
Object File Type: Dynamic link library
File Operating System: Windows NT 32-bit
MIME Type: application/octet-stream
User Popularity Rating:
Developer and Software Information
Software Developer: Bitdefender S.R.L. Bucharest, ROMANIA
Software Program: Bitdefender® ATC
Legal Copyright: © Bitdefender S.R.L. All rights reserved.
File Details
Character Set: Unicode
Language Code: English (U.S.)
File Flags: (none)
File Flags Mask: 0x003f
Entry Point: 0x52e0
Code Size: 153088

What are atcuf32.dll Error Messages?

Dynamic Link Library atcuf32.dll Errors

Atcuf32.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like atcuf32.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like certutil.exe - to follow. These files were created so that multiple programs (eg. BitDefender) could share the same atcuf32.dll file, saving valuable memory allocation, therefore making your computer run more efficiently.

Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DLL file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when atcuf32.dll is attempted to be loaded either when BitDefender is starting up, or in some cases already running. Some of the most common atcuf32.dll errors include:

Your atcuf32.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with BitDefender), or deleted by a malware infection. Furthermore, atcuf32.dll file corruption could be caused from a power outage when loading BitDefender, system crash while loading atcuf32.dll, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

How to Fix atcuf32.dll Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your atcuf32.dll issue. These troubleshooting steps are listed in the recommended order of execution.

Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. When you see the search box, type "System Restore" and press "ENTER".
  3. In the search results, find and click System Restore.
  4. Please enter the administrator password (if applicable / prompted).
  5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
  6. Restore your computer to that backup image.

If the Step 1 fails to resolve the atcuf32.dll error, please proceed to the Step 2 below.

Step 2: If recently installed BitDefender (or related software), uninstall then try reinstalling BitDefender software.

You can uninstall BitDefender software by following these instructions (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "Uninstall" and press "ENTER".
  3. In the search results, find and click "Add or Remove Programs"
  4. Find the entry for BitDefender and click "Uninstall"
  5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall BitDefender software.

If this Step 2 fails as well, please proceed to the Step 3 below.



Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many atcuf32.dll error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

  1. Hit the Windows Start button
  2. In the search box, type "Update" and press "ENTER".
  3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
  4. If updates are available for download, click "Install Updates".
  5. After the update is completed, restart your PC.

If Windows Update failed to resolve the atcuf32.dll error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.

If Those Steps Fail: Download and Replace Your atcuf32.dll File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate atcuf32.dll file version. We maintain a comprehensive database of 100% malware-free atcuf32.dll files for every applicable version of BitDefender. Please follow the steps below to download and properly replace you file:

  1. Locate your Windows operating system version in the list of below "Download atcuf32.dll Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy this file to the appropriate BitDefender folder location:
    Windows 10: C:\Program Files\Bitdefender Antivirus Free\
    Windows 10: C:\Program Files\Bitdefender Antivirus Free\atcuf\264375509705032704\
  4. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.

GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve atcuf32.dll problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.

Download atcuf32.dll Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying atcuf32.dll to your appropriate Windows system directory. Bitdefender typically does not release BitDefender DLL files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing atcuf32.dll and all other DLL files for BitDefender. An incorrectly installed DLL file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10

Files Related to atcuf32.dll

DLL Files Related to atcuf32.dll

File Name Description Software Program (Version) File Size (bytes) File Location Dynamic Link Library BitDefender 12260864 C:\Windows\assembly\NativeImages_v2.0.50727_32\...
AtcPlugin.dll AtcPlugin.dll Bitdefender Antivirus Free ( 112104 C:\Program Files\Bitdefender Antivirus Free\
api-ms-win-crt-locale-... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 19208 C:\Program Files\Bitdefender Antivirus Free\
vcomp140.dll Microsoft® C/C++ OpenMP Runtime Microsoft® Visual Studio® 2017 (14.14.26405.0) 153232 C:\Program Files\Bitdefender Antivirus Free\
ProxyManagerAl.dll Dynamic Link Library Bitdefender Antivirus Free ( 91832 C:\Program Files\Bitdefender Antivirus Free\

Other Files Related to atcuf32.dll

File Name Description Software Program (Version) File Size (bytes) File Location
api-ms-win-core-heap-l... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 19208 C:\Program Files\Bitdefender Antivirus Free\
api-ms-win-core-synch-... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 13160 C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
api-ms-win-core-memory... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 11624 C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
EtwRTDiagLog.etl Microsoft Event Trace Log BitDefender 1472 C:\Windows\System32\LogFiles\WMI\RtBackup\
PerfStringBackup.INI Windows Initialization BitDefender 1321920 C:\Windows\System32\


Optional Offer for WinThruster by Solvusoft | EULA | Privacy Policy | Terms | Uninstall

Browse Other File Extensions in Alphabetical Order :   # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

You are downloading trial software. The purchase of a one-year software subscription at the price of $39.95 USD is required to unlock all software features. Subscription auto-renews at the end of the term (Learn more). By clicking the "Start Download" button above and installing "Software", I acknowledge I have read and agree to the Solvusoft End User License Agreement and Privacy Policy.