Full Fix for Assassin’s Creed IV: Black Flag Not Working in Windows 10

Radu Tyrsina
by Radu Tyrsina
Founder & Editor-in-Chief
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Whenever Microsoft comes up with a new Windows version, it’s almost a given thing that many games out there won’t work. And now we have fresh reports regarding issues with the Assassin’s Creed IV: Black Flag game. Here’s what one affected user has been saying:

I am a Win10 user and I have a serious problem while I try to play Assasins creed IV Black flag. The game used to work on previous versions of windows but is not working since I upgraded to win10. the game does not open at all. and I even tried changing the compatibility mode still it doesn’t work. As soon as I click the icon, the curser shows a loading mark and stops and the game does not open


First of all, it goes without saying that you need to Run the troubleshooter for Windows apps and also check for whatever updates you might have pending, both from Windows Update, but also for your graphics card.

Assassin’s Creed IV: Black Flag not working on Windows 10, how to fix it?

According to users, they experienced a variety of issues with Assassin’s Creed 4 Black Flag. Speaking of issues, these are some of the most common problems that users reported:

  • Assassin’s Creed Black Flag doesn’t start, won’t launch – This is a relatively common problem with Assassin’s Creed. To fix the issue, try running the game as an administrator or in Compatibility Mode.
  • Assassin’s Creed Black Flag Windows 10 crash – If this problem occurs, the issue might be your drivers. Update your graphics card driver and check if the problem still persists.
  • Assassin’s Creed Black Flag not responding, launching – This is just a variation of this error, and in order to fix it, be sure to check if your antivirus is interfering with the game in any way.
  • Assassin Creed IV Black Flag has stopped working – If your game suddenly stops working, the issue might be a problematic third-party application, so be sure to remove it. If the issue still persists, feel free to try any other solution from this article.

Solution 1 – Check your antivirus

Antivirus tools are a necessity, but if you can’t run Assassin’s Creed 4 Black Flag on your PC, the problem might be your antivirus. Sometimes a third-party antivirus tool can interfere with your game and cause this problem to appear. However, you can easily fix that simply by disabling certain antivirus features.

If that doesn’t help, you might have to temporarily disable your antivirus as a workaround. In last case scenario, you might even have to remove your antivirus and check if that solves the issue. Even after you remove your antivirus, you’ll remain protected with Windows Defender, so there’s no need to worry about your safety.

If the issue still persists, you might want to disable Windows Defender temporarily and check if that solves the issue. Another way to fix this problem is to switch to a different antivirus solution. There are many great antivirus tools on the market, but currently, the best are Bitdefender, Panda Antivirus, and BullGuard. These are all great tools, so feel free to try any of them.

Solution 2 – Install the game in Compatibility mode

What you could try is to install the game in compatibility mode and check if that helps. Here’s what you need to do:

  1. Download the game from the manufacturer’s website.
  2. Right-click on the game setup file and click on Properties.
    Assassin's Creed Black Flag won't launch
  3. Click on the Compatibility tab and check the box Run this program in compatibility mode for and select older version of Windows. Click on Apply and OK to save changes.
    Assassin's Creed Black Flag doesn't start
  4. Once this is done, try to install the game again.

Solution 3 – Verify the integrity of game files

Sometimes you might experience problems with Assassin’s Creed 4 Black Flag due to corrupted files. Your game files can get corrupted, and in order to fix the problem, you need to verify the integrity of game cache. This is rather simple and you can do it by following these steps:

  1. Start Steam and go to your game library.
  2. Locate Assassin’s Creed 4 Black Flag on the list and right click it. Choose Properties from the menu.
    Assassin's Creed Black Flag Windows 10 crash
  3. Now navigate to Local Files tab and click Verify integrity of game files button.
    Assassin's Creed Black Flag not responding, launching
  4. The verification process will now start. This process can take about 10 minutes or so, so try not to interrupt it.

Once the scan is finished, try to run the game again. If the scan can’t fix the problem, go to the game’s installation directory and remove the following files:

  • AC4BFSP.exe
  • DataPC.forge
  • DataPC_patch.forge

After doing that, verify the integrity of the files again and the issue should be resolved.

Solution 4 – Remove the problematic applications

A couple of users have been saying that by removing such apps as Samsung Link, WindowFX, Tweak7, ObjectDock has solved the problem, even if there’s no clear link between them and the game.


To remove these files, the best way would be to use an uninstaller software. If you’re not familiar, uninstaller software can remove any application from your PC along with all of its files and registry entries. If any application is interfering with the game, you can easily remove it by using one of these tools.</p>

If you’re looking for a good uninstaller, we suggest you try IOBit Uninstaller (free), Revo Uninstaller or Ashampoo Uninstaller. Once you remove those applications, the problem should be resolved.

Solution 5 – Reinstall the game to the C drive

According to users, they managed to fix problems with Assassin’s Creed 4 Black Flag simply by reinstalling the game to their C drive. Many users tend to install games on a different drive in order to save space, but it seems that Assassin’s Creed 4 won’t work unless you install it on the C drive.

This is a bit tedious solution since you have to install the game again, but once you install it, the problem should be completely resolved.

Solution 6 – Replace the DLL files

Assassin’s Creed 4 Black Flag requires certain DLL files from Windows in order to run properly, and if these files are missing or not suitable, you might encounter certain issues with the game. Many users reported that the game won’t work due to XAudio2_7.dll file. To fix the problem, go to C:\Windows\sys>tem32 and create a copy of XAudio2_7.dll. Save the copy to your Desktop.

Now go to the game’s installation directory and locate the Launcher folder. In there, you should find XAudio2_7.dllg> file. Copy that file to the C:\Windows\system32 and replace the old file. After doing that, the problem should be resolved and the game will start working again.

Several users reported that other files can create this problem as well. To fix the problem, first you need to navigate to C:\Windows\system32 and <strong>C:\Windows\syswow64</stron directories. Locate the following files, and copy them to your Desktop as a backup:

  • D3DCompiler_43
  • D3DX9_43
  • xinput1_3

Now go to Assassin’s Creed 4 Black Flag installation directory and find the x86 version of the aforementioned files. Copy those files to <strong>C:\Windows\system32. Now locate the x64 version of the files and copy them to C:\Windows\syswow64 directory.</str

After doing that, the problems with the game should be resolved.

Solution 7 – Update your graphics card driver

If you can’t run Assassin’s Creed 4 Black Flag on your PC, the problem might be your graphics card driver. Outdated drivers can cause this problem to appear, and in order to fix it, we highly recommend you to keep your drivers up to date. To see how to update your drivers, be sure to check our guide on how to update graphics card driver.

We also strongly recommend TweakBit’s Driver Updater (approved by Microsoft and Norton) to automatically download all the outdated drivers on your n>PC. This tool will keep your system safe as you can manually download and install the wrong driver version.

Disclaimer: some features of this tool are not free.

Solution 8 – Remove your save game files

If you can’t start Assassin’s Creed 4 Black Flag, the problem might be your save game files. Sometimes your save games can get corrupted and that can prevent the game from running. The game will try to load the corrupted save file, and since it won’t be able to run it, the game will crash.

However, you can fix the problem simply by moving your save game files to a different location. Simply go to the game’s installation directory, by default it should be C:\Program Fileion”>s (</span>x86)\Ubisoft\Ubisoft Game Launcher\savegames\<User ID>\<Number> and locate your save game files. Now move them to your Desktop and try to start the game again.

Solution 9 – Run the game as administrator

If the problem still persists, you might be able to solve it simply by running the game as an administrator. To do that, just follow these steps:

  1. Locate the game’s shortcut and >right click it.
  2. Choose <s< span=””>trong>Run as administrator from the menu.
    Assassin Creed IV Black Flag has stopped working</s<>

If this workaround works for you, you’ll have to use it every time you want to start Assassin’s Creed 4 Black Flag on your PC.

Unfortunately, at the moment only these are the possible fixes we know. If you are aware of others, don’t hesitate and do share with us.

Editor’s Note: This post was originally published in November 2015 and has been since completely revamped and updated for freshness, accuracy, and comprehensiveness.


  • There are thousands of people claiming the same thing..including myself…Thousands!!..I have tried every fix listed on dozens of websites.. ..and spent well over a hundred hours trawling support discussions and complaining to Ubisoft..not one single fix worked and Ubisoft refuses to comment..I have seen thousands of people saying the exact same thing..the same problem..but Ubisoft ignores these people…Thats a lot of people who never got to play a game that they payed good money for..and Ubisoft doesn’t seem to care about this problem at all..They already made enough money from it and wont support further patches or support….Ive had this problem for over 3 years now…and it still doesnt run..Steam offers no support for this product and Ubisoft dont respond to support requests for it…Its dead in the water….very disappointing….