Fix MSVCR100.dll Missing Error in Assassin’s Creed 4 Black Flag (Working Fix)

Trying to launch Assassin’s Creed IV Black Flag on Windows 10 or Windows 11 but getting an error saying that MSVCR100.dll is missing from your computer? You are not alone.

This problem usually appears when Windows does not have the Microsoft Visual C++ runtime component required by the game. Instead of downloading a random DLL file from an unofficial website, the safer approach is to install the corresponding Microsoft Visual C++ Redistributable package.

In this guide, I'll show you how to fix the MSVCR100.dll missing error, repair the required runtime components, verify your game files, and troubleshoot the problem if Assassin's Creed IV Black Flag still refuses to launch.

🚨 What Does the MSVCR100.dll Error Mean?

The MSVCR100.dll file is part of the Microsoft Visual C++ 2010 runtime environment. Older Windows games and applications can depend on these runtime libraries. Microsoft identifies MSVCR100.dll as part of the Visual C++ 2010 redistributable family. :contentReference[oaicite:2]{index=2}

If the required runtime is missing, damaged, or the wrong architecture is installed, Windows may display messages such as:

• MSVCR100.dll is missing from your computer.
• The program can't start because MSVCR100.dll is missing.
• MSVCR100.dll was not found.
• Reinstalling the program may fix this problem.

🔍 Why Does Assassin’s Creed IV Black Flag Show This Error?

Assassin's Creed IV Black Flag was originally released in 2013, so it can depend on older Windows runtime components that may not be installed on a newer Windows installation.

The error can also appear after reinstalling Windows, moving the game to another computer, uninstalling older Visual C++ packages, or when a required runtime installation has become corrupted.

📋 Before You Start

• Make sure Assassin's Creed IV Black Flag is installed from a legitimate source.
• Close the game and Ubisoft Connect/Steam before installing the runtime.
• Use an administrator account if Windows requests permission.
• Download the Visual C++ package from Microsoft.

✅ Main Fix: Install Microsoft Visual C++ 2010 Redistributable

The main solution is to install the official Microsoft Visual C++ 2010 Service Pack 1 Redistributable Package. Microsoft's current documentation lists Visual Studio 2010 SP1 as a legacy, unsupported runtime and provides the x86 and x64 redistributable packages. :contentReference[oaicite:3]{index=3}

Open the Microsoft download page and select the appropriate Visual C++ 2010 SP1 redistributable package. For older games, installing the x86 version is particularly important because a 64-bit version of Windows can still run 32-bit applications using 32-bit runtime libraries.

🧩 Install the x86 Version

For a 32-bit game, the x86 Visual C++ runtime is normally the important component. Even if you are running 64-bit Windows, do not assume that installing only the x64 package will provide every runtime needed by a 32-bit game.

Download the official Microsoft Visual C++ 2010 SP1 redistributable package from the Microsoft page above and select the x86 installer.

🖥️ Should You Install x64 Too?

If your Windows installation is 64-bit, you can also install the official x64 Visual C++ 2010 SP1 redistributable. This does not replace the x86 package. The two packages serve different application architectures.

⚙️ How to Install the Runtime

After downloading the Microsoft Visual C++ installer, follow these steps:

🔄 Restart Your PC

After installing the Visual C++ runtime, restart Windows. This allows Windows to properly initialize the newly installed runtime components before you launch Assassin's Creed IV Black Flag again.

After restarting, launch the game normally through your legitimate game launcher.

🛠️ Fix 2: Verify Assassin’s Creed IV Black Flag Game Files

If the MSVCR100.dll message continues after installing the Visual C++ runtime, the game's own installation may have missing or corrupted files. If you own the Steam version, Steam provides a built-in Verify Integrity of Game Files feature that checks whether the game's files are installed correctly. :contentReference[oaicite:5]{index=5}

🎮 Fix 3: Check Ubisoft Connect

Assassin's Creed IV Black Flag is a Ubisoft game and its PC versions can involve Ubisoft's launcher and account services. If you purchased the game through Ubisoft, open Ubisoft Connect and make sure you are signed in to the account that owns the game.

If the launcher offers a repair or file-verification option for your installation, use that option rather than replacing individual game DLL files manually.

🧰 Fix 4: Check the Game's Additional Components

Older PC games can rely on additional components installed alongside the game. Steam notes that some games include secondary installers for components such as DirectX, PhysX, Games for Windows Live, Visual C++ components, or Windows updates, and that these installers may need to be run manually if the initial installation was interrupted. :contentReference[oaicite:6]{index=6}

Check the Assassin's Creed IV Black Flag installation folder for folders containing secondary installers. A typical Steam installation location may look similar to:

Your actual Steam library may be installed on another drive or in another folder.

⚠️ Do NOT Download MSVCR100.dll From Random DLL Websites

You may find websites offering individual MSVCR100.dll files. It might seem like the quickest solution to download the file and copy it into the Assassin's Creed folder, but this is not the approach I recommend.

Microsoft's documentation identifies MSVCR100.dll as part of the Visual C++ 2010 runtime family, so reinstalling the appropriate redistributable is the cleaner way to restore the runtime. :contentReference[oaicite:7]{index=7}

🔧 Fix 5: Repair Windows System Files

If other applications are also reporting missing or damaged Windows components, you can use Windows' built-in system file repair tools. Open Command Prompt as Administrator and run:

Wait until the scan reaches 100%. If Windows reports that it repaired system files, restart your computer and test the game again.

🛠️ Fix 6: Run DISM If Windows Components Are Damaged

If SFC cannot repair the system files, you can also use Microsoft's Deployment Image Servicing and Management tool. Open Command Prompt as Administrator and run:

Allow the command to complete before restarting Windows. This step is useful when the problem is broader than the game itself.

🪟 Fix 7: Try Compatibility Settings

If the MSVCR100.dll message is gone but Assassin's Creed IV Black Flag still does not start correctly, you can test Windows compatibility settings.

🔄 Fix 8: Reinstall the Visual C++ Runtime

If the Visual C++ installer reports that the runtime is already installed but the MSVCR100.dll error continues, the existing installation may be damaged.

Open Windows Settings and go to the installed applications list. Look for the Microsoft Visual C++ 2010 redistributable entry and, where appropriate, repair or reinstall it using Microsoft's official package.

After reinstalling, restart your PC and test Assassin's Creed IV Black Flag again.

✅ Final Checklist

❓ Frequently Asked Questions

What is MSVCR100.dll?
MSVCR100.dll is a Microsoft Visual C++ runtime library associated with Visual Studio 2010 applications.

Why is MSVCR100.dll missing in Assassin's Creed IV Black Flag?
The required Visual C++ 2010 runtime may not be installed, may be damaged, or the game may be unable to access the required runtime component.

Should I download MSVCR100.dll separately?
No. The safer approach is to install the official Microsoft Visual C++ redistributable that provides the runtime library.

Do I need the x86 or x64 version?
For a 32-bit game, the x86 runtime is important even when Windows itself is 64-bit. Installing both official architectures can be useful when troubleshooting multiple applications.

Will installing Visual C++ 2022 fix MSVCR100.dll?
Not necessarily. MSVCR100.dll belongs to the older Visual C++ 2010 runtime family, so installing the matching legacy runtime is the relevant fix.

What if the game still doesn't launch?
Verify the game files, check the game's secondary installers, make sure the launcher is working correctly, and use Windows system-file repair tools if necessary.

Is this fix safe?
Yes, when you obtain the Visual C++ redistributable from Microsoft and avoid unofficial DLL downloads.

🎯 Final Thoughts

The MSVCR100.dll missing error can look like a complicated Assassin's Creed IV Black Flag problem, but in many cases it comes down to a missing Visual C++ 2010 runtime component.

The first thing I recommend is installing Microsoft's official Visual C++ 2010 SP1 Redistributable and restarting Windows. If the error remains, verify the game's files and check its additional installers. Steam's official troubleshooting documentation specifically recommends file verification when game files are missing or corrupted. :contentReference[oaicite:8]{index=8}

Most importantly, avoid replacing individual DLL files from unknown websites. Restoring the complete Microsoft runtime is a much safer and more reliable approach.