FIX: Mfc100u.dll is missing error on Windows 10

Aleksandar Ognjanovic
by Aleksandar Ognjanovic
Troubleshooting Expert
Aleksandar's main passion is technology. With a solid writing background, he is determined to bring the bleeding edge to the common user. With a keen eye, he always spots the next big thing surrounding... Read more
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  • The mfc100u.dll error is quite common especially among gamers and one culprit may be missing updates.
  • A damaged program might also generate this problem and in this case an advanced tool like Restoro can work like a charm.
  • Unsuspected malware can always stand behind an issue like the mfc100u.dll is missing error.
  • Considering the causes there are various solutions and in our article you'll find them all.
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The mfc100u.dll type of errors can pose a serious issue, especially for vivid gamers that need redistributables to run most of the games.

The one problem that’s quite frequently reported in Windows 10 introduces an error prompt that informs a user that the mfc100u.dll file is missing.

As you might know, DLL files are important secondary files that enable a certain application to work on the Windows platform.

The special emphasis goes to DirectX and Virtual C++ runtime and their DLL files placed in the System32 folder. If only a single one is missing, you won’t be able to run the program at hand and the system will prompt you with an error.

Luckily, we prepared more than a few solutions that should help you resolve this issue. If you’re stuck with a missing DLL file, make sure to check them out below.


How do I fix mfc100u.dll is missing error in Windows 10?

1. Use Restoro

Never worry about the malware or virus threats ever again because Restoro is the tool that can take care of all these issues for you and do so much more for your PC health.

Thanks to this software you can surf the internet in complete safety, since it can detect any potential dangerous site. A great feature is its capability of repairing errors that reoccur as a consequence of virus damage.

Would you like for your PC to run as smooth as it did the first time you got it? With this app you can actually restore corrupted system settings and registry values to their default state.

Don’t hesitate to run this intelligent software anytime you encounter a mfc100u.dll was not found error. Most probably it will be able to solve it in a few minutes.

Another very important aspect is that you can reinstall broken drivers and even recover license keys and passwords so you can maintain your system functioning at its best capacity at all times.

A great perk is that you ca perform a deep scan of your hardware for free, including the RAM and the CPU. When the scanning ends you’ll receive a detailed report of the state of your PC.

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Restoro is a reliable third-party DLL fixer which uses a built-in automated system and an online library full of functional DLLs to replace and repair any files that might be corrupted or damaged on your PC.

All you need to do to resolve your PC’s problems is to launch it, and simply follow the on-screen instructions to start the process, as everything else is covered by the software’s automated processes.

This is how you can fix registry errors using Restoro:

  1. Download and install Restoro.
  2. Launch the software.
  3. Wait for it to scan your PC for any stability issues and possible malware.
  4. Press Start Repair.
  5. Restart your PC for all the changes to take effect.

After this process is completed your PC will be as good as new, and you will no longer have to deal with BSoD errors, slow response times, or other similar issues.

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2. Add all the Redistributables available

  1. Go to the Microsoft official site and download the latest version of Visual Studio.
  2. Select the preferred Visual C++, with emphasis on proper architecture and language.
  3. Download and install various versions and restart your PC.mfc100u.dll is missing
  4. Try to start the troubled program again.

Now, even though users aren’t forced to use all iterations of Visual C++, it will cost you nothing to install all available versions.

If one version, say Visual C++ 2015, supports one application or a game for that matter, that doesn’t mean that other, older games will work just as fine.

They may as well prompt you with the above-mentioned DLL error and you’ll get stuck in the never-ending cycle.

So, for that purpose, in order to make sure you fix the navigate to the official support site and download all Visual C++ iterations. Make sure to install as many redistributables as you can and restart your PC.

Run a System Scan to discover potential errors

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Run a PC Scan with Restoro Repair Tool to find errors causing security problems and slowdowns. After the scan is complete, the repair process will replace damaged files with fresh Windows files and components.

Once you’ve dealt with it, the programs should start without the mfc100u.dll is missing error reappearing every time.


3. Install the latest Windows updates

  1. Press Windows key + I to summon the Settings app.
  2. Choose Updates & security.
  3. Click on the ‘Check for updates button.mfc100u.dll is missing
  4. Install updates and restart your PC.

Once you install a certain feature that’s vital for Windows 10 performance in various categories, you can expect updates to come via Windows Update.

Most of the time, those are security, cumulative updates of Visual C++, but they can serve you well mfc100u.dll redistributable.

As you’re well aware, Windows 10 updates are mandatory and automatically provided within inactive hours. But, since we’re having a problem here, you might speed up the procedure and check for updates manually.


4. Reinstall the problematic program

  1. Type Control in the Windows Search bar and open Control Panel.
  2. In the Category view, choose to Uninstall a program.
  3. Right-click the troubled program or game and choose Repair.
  4. Follow the further instructions and, after it’s done, restart your PC.

Still, on some rare occasions, the Visual C++ installation or reinstallation won’t suffice. Namely, the program installation might be culpable for the error at hand.

Related files stored in the installation folder can get corrupted or incomplete, which will, consequently, result in errors. To address this matter, you’ll need to either repair or reinstall the program.

Since the majority of affected programs are games, you can repair them easily, either by navigating to Control Panel or by using desktop client tools that come with Steam, Batttle.net, etc.

With these tools, you’ll be able to scan for installation integrity and repair the installation if needed.

However, if you’re running a game without clients, you should follow the instructions below to repair the troubled program or game:

After that, in combination with previous solutions, you should be relieved of the mfc100u.dll is missing error in Windows 10.

5. Scan your system for malware

  1. Open Windows Defender from the taskbar notification area.
  2. Choose Virus & threat protection.
  3. Click on the ”Run a new advanced scan” option.d3dx9_43.dll is missing
  4. Choose Windows Defender Offline Scan and click on the Scan now button.

Finally, this last solution isn’t a solution per se. This is more of a precaution measure you should take in case you’re missing DLL files, including mfc100u.dll.

Namely, malware infections are mostly the reason for the sudden disappearance of DLL files. Yes, there’s a chance you’ve deleted some of them on your own, but those are isolated cases and virus threat is a problem reported daily.

What you’ll need to do is to perform a deep scan and check for malware presence on your PC. You can use third-party antimalware solutions or Windows Defender – it’s your choice.


There are various causes to the mfc100u.dll errors but most of the times a corrupted file or program is at the root of the issue. Make sure to follow our steps correctly and we ensure you that you will fix the problem with no headaches.

In case you have further issues, questions, suggestions or remarks, don’t forget to share them in the comments below.


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