What is bdfdll?

The genuine bdfdll.sys file is a software component of BitDefender Antivirus by SOFTWIN.
A supporting DLL for the BitDefender AntiVirus suite, this file runs in the background as BitDefender monitors for malicious activity. BitDefender includes a robust antivirus scanning utility, antispyware, and numerous other features. It has the ability to perform on-demand targeted scans, as well as provide real-time protection. First released in 2001, BitDefender is now on its 17th version. Originally created by Softwin, BitDefender spun off as a private entity in 2007.

BDfDLL stands for BitDefender Dynamic Link Library

Bdfdll.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if bdfdll.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for bdfdll drivers in need of updating

Bdfdll.sys file information

The process belongs to software bdfdll or BitDefender Free Edition (version v10) by SOFTWIN (

Description: Bdfdll.sys is not essential for the Windows OS and causes relatively few problems. The bdfdll.sys file is located in a subfolder of "C:\Program Files". The file size on Windows 10/8/7/XP is 8,704 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. It is a file with no information about its developer. The program has no visible window. The service has no detailed description. The bdfdll.sys file is not a Windows system file. bdfdll.sys appears to be a compressed file. Therefore the technical security rating is 51% dangerous, however you should also read the user reviews.

Uninstalling this variant: If problems with bdfdll.sys come up, you can completely remove BitDefender Free Edition v10 (Control Panel ⇒ Uninstall a Program).

Recommended: Identify bdfdll.sys related errors

Important: Some malware camouflages itself as bdfdll.sys. Therefore, you should check the bdfdll.sys 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

BitDefender9 Anti virus
Part of Bitdefender Internet Security Suite
  David Peire  

Summary: Average user rating of bdfdll.sys: based on 5 votes with 3 user comments. 4 users think bdfdll.sys is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. One user is not sure about it.

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Best practices for resolving bdfdll issues

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

bdfdll.sys [all]