How to Download and Repair Atc.sys (3 Step Guide)

Last Updated: 11/28/2025
[Time Needed for Reading: ~4-6 minutes]

atc.sys, also known as a Bitdefender Active Threat Control Filesystem Minifilter file, was created by Bitdefender for the development of Bitdefender® ATC. SYS files fall under under the Win64 EXE (Unknown) file type category.

atc.sys was first developed on 06/27/2018 for the Windows 10 Operating System in Adaware Antivirus 12.4.930.11587. The most recent version [file version 1.28.222.0 0x3790f9f] was introduced on 12/03/2018 for BitDefender 1.0.14.74.

Please continue reading to find your correct atc.sys file version download (free), detailed file information, and SYS file troubleshooting instructions.

File Analysis Provided by Jason Geater (Author)

File Overview

General Information ^✻
File Name:	atc.sys
File Extension:	SYS file extension
Description:	Bitdefender Active Threat Control Filesystem Minifilter
Object File Type:	Unknown
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:	0x1c90
Code Size:	1349120

View Other atc.sys Information

File Info	Description
File Size:	1654 kB
File Modification Date/Time:	2020:01:23 07:44:36+00:00
File Type:	Win64 EXE
MIME Type:	application/octet-stream
Machine Type:	AMD AMD64
Time Stamp:	2019:09:22 10:38:14+00:00
PE Type:	PE32+
Linker Version:	14.0
Code Size:	1349120
Initialized Data Size:	332288
Uninitialized Data Size:	0
Entry Point:	0x1c90
OS Version:	10.0
Image Version:	10.0
Subsystem Version:	6.1
Subsystem:	Native
File Version Number:	1.28.222.0
Product Version Number:	13.0.0.0
File Flags Mask:	0x003f
File Flags:	(none)
File OS:	Windows NT 32-bit
Object File Type:	Unknown
File Subtype:	0
Language Code:	English (U.S.)
Character Set:	Unicode
Company Name:	Bitdefender S.R.L. Bucharest, ROMANIA
File Description:	Bitdefender Active Threat Control Filesystem Minifilter
File Version:	1.28.222.0 0x3790f9f
Internal Name:	ATC.SYS
Legal Copyright:	© Bitdefender S.R.L. All rights reserved.
Product Name:	Bitdefender® ATC
Product Version:	13

^✻ Portions of file data provided by Exiftool (Phil Harvey) distributed under the Perl Artistic License.

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What are atc.sys Error Messages?

atc.sys Blue Screen of Death (BSOD) Errors

There are a number of reasons why you could be encountering issues with atc.sys. Most of the issues concerning sys files involve Blue Screen of Death (BSOD) errors. These types of atc.sys errors can be cause by hardware problems, outdated firmware, corrupt drivers, or other software-related (eg. BitDefender update) issues. Some of these errors include:

atc.sys could not be found.
atc.sys failed to load.
The file atc.sys is missing or corrupt.
Windows failed to start - atc.sys.

A problem has been detected and Windows has been shut down to prevent damage to your computer. The problem seems to be caused by the following file: atc.sys.

:( Your PC ran into a problem that it couldn't handle, and now needs to restart. You can search for the error online: [BSOD] (atc.sys).

STOP 0x0000007E: SYSTEM THREAD EXCEPTION NOT HANDLED (atc.sys) STOP 0x0000003B: SYSTEM SERVICE EXCEPTION (atc.sys) STOP 0x0000001E: KMODE EXCEPTION NOT HANDLED (atc.sys) STOP 0×0000007A: KERNEL DATA INPAGE (atc.sys) STOP 0x00000050: PAGE FAULT IN A NONPAGED AREA (atc.sys) STOP 0x0000000A: IRQL NOT LESS EQUAL (atc.sys)

It's Critical to Resolve Blue Screen of Death Errors

In the majority of cases, you will encounter atc.sys BSOD errors after you've installed new hardware, software (BitDefender), or performed a failed Windows Update. In other cases, software corruption caused by a malware infection can lead to atc.sys Blue Screen of Death errors. Therefore, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

GEEK TIP : As a rule of thumb, it's always a good idea to create a Windows "Snapshot" backup / System Restore Point before making any hardware or software changes to your computer. That way, it's very easy to restore your system in the unfortunate event you encounter a atc.sys Blue Screen of Death error after recent changes.

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How to Fix atc.sys 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 atc.sys 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):

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

If the Step 1 fails to resolve the atc.sys 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):

Hit the Windows Start button
In the search box, type "Uninstall" and press "ENTER".
In the search results, find and click "Add or Remove Programs"
Find the entry for BitDefender 1.0.14.74 and click "Uninstall"
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.

BitDefender 1.0.14.74

Bitdefender

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 atc.sys error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

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

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

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If Those Steps Fail: Download and Replace Your atc.sys 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 atc.sys file version. We maintain a comprehensive database of 100% malware-free atc.sys files for every applicable version of BitDefender. Please follow the steps below to download and properly replace you file:

Locate your Windows operating system version in the list of below "Download atc.sys Files".
Click the appropriate "Download Now" button and download your Windows file version.
Copy this file to the appropriate BitDefender folder location:

Windows 10: C:\Windows\System32\drivers\
Windows 10: C:\Program Files\Bitdefender Antivirus Free\
Windows 10: C:\Windows\System32\drivers\
Windows 10: C:\Program Files\adaware\adaware antivirus\AVC Engine\3.22.183.0\
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 atc.sys 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.

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Download atc.sys Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying atc.sys to your appropriate Windows system directory. Bitdefender typically does not release BitDefender SYS 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 atc.sys and all other SYS files for BitDefender. An incorrectly installed SYS file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

BitDefender 1.0.14.74

File Name

Software Version

File Version

Architecture

atc.sys

13.0.0.0

1.28.222.0 0x3790f9f

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	Bitdefender® ATC
Software Version:	13.0.0.0
File Version:	1.28.222.0 0x3790f9f
File Size:	1693368
File Date:	01/23/2020
MD5 Checksum:	a2595f4763fc5b30fb09e6c4a02ada23
SHA1 Checksum:	4af0b2bdca88966d02e733b2cdfb4feccc3e44ac
SHA256 Checksum:	7ebfcfd1e6e9d5ff6c955971b88f421b1f7963fde499e2a0aaa1dd3122808259
CRC32:
File Directory Location:	C:\Windows\System32\drivers\ C:\Program Files\Bitdefender Antivirus Free\

File Version, System, and Machine Information
File Type:	Win64 EXE
Image Version:	10.0
Initialized Data Size:	332288
Linker Version:	14.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Native
Subsystem Version:	6.1
File Modification Date/Time:	01/23/2020

Adaware Antivirus 12.4.930.11587

File Name

Software Version

File Version

Architecture

atc.sys

13.0.0.0

1.22.183.0 0xb6f6bd5

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	BitDefender® AntiVirus
Software Version:	13.0.0.0
File Version:	1.22.183.0 0xb6f6bd5
File Size:	1380880
File Date:	09/30/2019
MD5 Checksum:	992b9cabcbe2c063ddecb94dc1d0c7c3
SHA1 Checksum:	0b2e8505ddfe0164c809b7f1632aad92de522d47
SHA256 Checksum:	da57588cd86b0f03f0523a56790bfae570831f2114c04ec4860b805e09702004
CRC32:
File Directory Location:	C:\Windows\System32\drivers\ C:\Program Files\adaware\adaware antivirus\AVC ...

File Version, System, and Machine Information
File Type:	Win64 EXE
Image Version:	10.0
Initialized Data Size:	270336
Linker Version:	14.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Native
Subsystem Version:	6.1
File Modification Date/Time:	09/30/2019

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Files Related to atc.sys

SYS Files Related to atc.sys

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
bdelam.sys	Bitdefender Early Launch Anti-Malware Driver	Bitdefender (1.0.0.6)	22960	C:\Windows\Temp\527D94AF-D053-4381-B105-0D815D5...
gzflt.sys	BitDefender Gonzales FileSystem Driver	BitDefender Gonzales (2.0.0.110)	188384	C:\ProgramData\Microsoft\Windows Defender\Defin...
edrsensor.sys	BitDefender EDR Sensor	BitDefender® EDR (1.0.5.65.7ae749a)	309144	C:\Windows\Temp\527D94AF-D053-4381-B105-0D815D5...
atc.sys	Bitdefender Active Threat Control Filesystem Minifilter	Bitdefender® ATC (13)	1693368	C:\Windows\Temp\20954D5E-EB4B-46E4-861A-684C17E...
gemma.sys	BitDefender Generic Exploit Mitigation for Mainstream Applications Filesystem Minifilter	BitDefender® AntiVirus (13)	564136	C:\Windows\Temp\527D94AF-D053-4381-B105-0D815D5...

Other Files Related to atc.sys

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
CBS.log	Log	BitDefender 1.0.14.74	1226468	C:\Windows\Logs\CBS\
WmiApRpl.ini	Windows Initialization	BitDefender 1.0.14.74	29736	C:\Windows\inf\WmiApRpl\0009\
api-ms-win-core-profil...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17134.12)	10600	C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
diagwrn.xml	Extensible Markup Language	BitDefender 1.0.14.74	44683	C:\Windows\Panther\UnattendGC\
api-ms-win-core-memory...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17134.12)	19208	C:\Program Files\Bitdefender Antivirus Free\

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