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Game Will Not Launch Due To BfLLR.DLL

Some users may encounter an error where games are unable to launch because some third-party anti-cheat software blocks your connection due to the existence of BfLLR.DLL.
The issue is that the anti-cheat mechanism used by some games is erroneously blocking certain .DLL files used by various applications that are in no way related to cheating. BfLLR.DLL is currently one of those files. Ultimately, the fix should come from the anti-cheat software engineers fixing this faulty behavior.

Unfortunately, if you are using a legacy adapter – E2100, 2100, or Xeno Pro – then the only drivers that we know for certain to work with your adapters are those that come with their driver suite. You should use the latest version of the drivers that came from the manufacturer of your card. If that does not resolve the problem, you can read our knowledgebase article on legacy devices, which includes the link to the latest known drivers for these devices, by clicking here.

The drivers under Windows 8.1 should still work with Windows 10. However, the BfLLR.DLL file is included in this suite, and cannot be removed. We have had some reports that users have been able to play those games after updating to these drivers, however. We are unsure as to why this sometimes works and sometimes does not. This is ultimately in the hands of the developers of the anti-cheat software.

If you are using the Killer E2200, or any of our wireless adapters, and your machine came preinstalled with the Killer Network Manager, you can update to the new Killer Control Center instead of the Killer Network Manager. The Killer Control Center does not use BfLLR.DLL. You can use these steps to remove the Killer Network Manager and install the Killer Control Center. We recommend clean-installing the Killer Control Center.

  1. Click here for our guide on clean installing the latest Killer Control Center. 
  2. Once you have followed the complete clean-install guide, verify that C:\Windows\System32\BfLLR.DLL is no longer present. You may need to show hidden files in this folder by clicking View and putting a check in the box for Hidden Items. If the file is still present, set a system restore point (https://support.microsoft.com/en-us/help/4027538/windows-create-a-system-restore-point) and then manually delete the BfLLR.dll.
  3. If you are unable to delete the BfLLR.DLL file even with no antivirus program installed, you may have to do it from safe mode – https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode
Updated on April 4, 2019

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