Assassin's creed 4 black flag not launching

The most common issues found in AC 4 Black Flag is that it either has a default resolution configuration that is not compatible with lower end PC’s or there might be some .dll files missing, due to which the games crashes at random moments while you are playing. 

Assassin's creed 4 black flag not launching


Since AC Rogue is working smoothly on your PC, your best fix is to try adjusting your AC4’s resolution and graphic settings similar to AC Rogue’s settings.




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Run AC4BFSP.EXE as an Administrator

  • Close Steam client.
  • Open Windows explorer.
  • Go to the installation folder of Assassin’s Creed IV Black Flag (This is default location: “C:\Program Files (x86)\Steam\SteamApps\common\Assassin’s Creed IV Black Flag“).
  • Look for “AC4BFSP.EXE” file.
  • When you find, right-click on it and press “Run this file as an administrator“.
  • Launch Assassin’s Creed IV Black Flag.

Install game in Compatibility mode

I suggest you to follow these steps to install the game in compatibility mode and check if that helps.

  • Download the game from the manufacturer’s website.    
  • Right-click on the game setup file and click on ‘properties’.
  • Click on the ‘compatibility’ tab and check the box ‘Run this program in compatibility mode for’ and select Windows 10 from the drop down menu and proceed with the installation. Once this is done, restart the computer and check if the issue persists
Hope this helps in resolving your issue. Do contact us for further queries. We will be happy to assist.

Replace the DLL files

In order to run properly, Assassin’s Creed Black Flag needs some DLL files from Windows. When these files are missing or corrupt, the game will encounter some issues. It has been noted that when XAudio2_7.dll file is missing or corrupt, the game won’t start. In this case, navigate to C:\Windows\system32 and create a backup of the file by copying it to the desktop. Now, navigate to the installation directory of the game and find the Launcher folder. You will find the XAudio2_7.dll file there. Copy this file to C:\Windows\system32 to replace the one that was previously there. Check if your game issues have been resolved.

There are also other files that can cause Assassin’s Creed Black Flag issues on Windows 10. Here is a list of some of them:

To fix this problem, you need to go to the C:\Windows\system32 and C:\Windows\syswow64 directories and back up these files to your desktop. Now, navigate to the game’s installation directory and look for the x86 versions of the files listed above. Then copy them to C:\Windows\system32. Do the same for the x64 versions of the files, but they need to be copied to C:\Windows\syswow64. Your Assassin’s Creed Black Flag problems should be resolved after this.

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