How to fix
Mfc100u.dll missing or not found error
on Windows

Hello. When I try to run certain video games on my Windows PC I get the "Mfc100u.dll is missing" error. Is there a way to fix this?

The mfc100u.dll missing or not found error is a fairly common problem for Windows users, especially gamers. One possible cause of this error is a lack of system updates. The mfc100u.dll file is part of the Microsoft Visual C++ Redistributable package, and if the required updates are not installed, an error message may appear.

Another possibility for the mfc100u.dll error is a corrupted program. If a specific program on the computer is corrupted or having problems, it may fail to locate or load the mfc100u.dll file correctly. When attempting to launch or use the program, an error message may be displayed.

The mfc100u.dll error can have a variety of consequences for users. For starters, it can prevent the affected program from running at all. This is especially aggravating for gamers who rely on specific applications or games for entertainment. Furthermore, the error may result in system instability, crashes, or freezes, negatively impacting the overall user experience on the computer.

There are several potential solutions to the mfc100u.dll missing or not found error. One method is to make certain that all Windows updates are installed on the system. Microsoft releases updates and patches on a regular basis to address known issues, such as DLL errors. Furthermore, reinstalling the program that is causing the error can assist in replacing any damaged or missing files associated with it, potentially resolving the issue.

In this guide, you will find 5 steps that should help you fix Mfc100u.dll missing or not found error. You can also try using a maintenance tool like [d1] that can fix most system errors, BSODs,[ref en-1] corrupted files, and registry[ref en-2] issues. Otherwise, follow the step-by-step instructions below.

Method 1. Fix Corrupted System Files

Use Command Prompt commands to repair system file corruption:

• Open Command Prompt as administrator
• Use the following command and press Enter:
  sfc /scannow

• Reboot your system
• If SFC returned an error, then use the following command lines, pressing Enter after each:
  DISM /Online /Cleanup-Image /CheckHealth
  DISM /Online /Cleanup-Image /ScanHealth
  DISM /Online /Cleanup-Image /RestoreHealth

Method 2. Install Windows Updates

• Press the Windows key + R to open the Run box.
• Type ms-settings:windowsupdate in the text box and press Enter.
• Click the Check for updates button.

• If a new update is available, click the Download & Install all button.
• Restart your computer after the process is finished and check to see if the problem is fixed.

Method 3. Add all the Redistributable Packages

• Go to the official Microsoft website.
• Navigate to the Visual Studio page.
• Download the latest version of Visual Studio.
• Choose the preferred Visual C++ option, considering the appropriate architecture and language.
• Download the selected version of Visual C++.
• Install Visual Studio and Visual C++ on your computer.

• Restart your PC after the installation process is complete.
• Attempt to launch the problematic program again.

Method 4. Reinstall the Affected Application

• Type Control in the Windows Search bar and open Control Panel.
• In the Control Panel, select the Category view.
• Choose the option to Uninstall a program.

• Locate the troubled program or game from the list.
• Right-click on the troubled program or game and select the Repair option.
• Follow the further instructions provided during the repair process.
• Once the repair is complete, restart your PC to apply the changes.

Method 5. Run a Malware Scan

It is possible that a malware infection may be the cause of Mfc100u.dll missing or not found error in Windows. It is important to run a comprehensive security scan to rule out this possibility and ensure that the computer is not infected. This can help to prevent further issues with the Windows operating system and ensure that it is functioning properly.

If you have access to a security scanner, or if your organization pays for one, you can use it to scan your entire system to check for a virus infection. Otherwise, you can use Windows Defender to scan your system:

• Click on the Windows Start menu or press the Windows key on your keyboard.
• Type Microsoft Defender in the search bar and click on Microsoft Defender Antivirus to open the application.
• Click on the Virus & threat protection option in the left-hand menu.
• Click on the Quick scan or Full scan option, depending on your preference.

• If you choose Quick scan, Microsoft Defender Antivirus will scan the most vulnerable and commonly infected areas of your computer.
• If you choose Full scan, Microsoft Defender Antivirus will scan your entire computer, including all files, folders, and programs.
• Click on the Scan now button to start the selected scan type and wait for the scan to complete.
• The time it takes will depend on the size of your hard drive and the number of files being scanned.
• Once the scan is complete, you will be informed of any detected threats, and you can choose to quarantine or remove them.
• If no threats are found, Microsoft Defender Antivirus will inform you that your device is secure.