# Missing MFC140U.DLL Error

## Description

When attempting to open Well Seeker Pro, the user receives the following error message:

![](https://100379801-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-McEwHTOM_v4MexTVGSe%2Fuploads%2FcUSVL5j4238pPTxEuITJ%2F0.png?alt=media)

## Cause

The **MFC140U.DLL** file is part of the Visual C++ Redistributable package for Microsoft Visual Studio. If this package is not installed on the user’s computer, they will get the above error. This issue is often seen just after installing the software on a new computer.

## Solution

To solve this issue, the user must download and install the Visual C++ Redistributable package for Microsoft Visual Studio.

First make sure that your Windows operating system is up to date. This may automatically install the package. To update Windows, follow these steps:

1. Press the Windows key and search for ‘windows update settings.’ Click on Windows Update Settings under Best Match.

![](https://100379801-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-McEwHTOM_v4MexTVGSe%2Fuploads%2FhQ7ePyDXg71s7k41QdkM%2F1.png?alt=media)

2. In the Windows Update dialog, click on Check For Updates. Follow the instructions to download and install any available updates. You may be required to restart your computer before the installation of all updates is complete.

<figure><img src="https://100379801-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-McEwHTOM_v4MexTVGSe%2Fuploads%2FSJfAm1aacXUwgc0seKWF%2Fimage.png?alt=media&#x26;token=7ae4a473-20ee-4f21-9966-4a896845d6ad" alt=""><figcaption></figcaption></figure>

If this does not download the package, you will need to download it manually. To do so, follow these steps:

1. Follow this link: [Latest supported Visual C++ Redistributable downloads | Microsoft Learn](https://learn.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist?view=msvc-170)
2. Scroll down to **Visual Studio 2015, 2017, 2019 and 2022**. Click on the two links highlighted in the image below to download both the x64 and x86 versions of the package to your computer.

<figure><img src="https://100379801-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-McEwHTOM_v4MexTVGSe%2Fuploads%2FmSr7ISDgqE0YRNaczbHD%2Fimage.png?alt=media&#x26;token=c1ccaa63-ff44-4828-a90c-441ebefb29c1" alt=""><figcaption></figcaption></figure>

3. Run **vc\_redist.x86.exe** and **vc\_resdist.x64.exe** to install the package on your computer. After installation is complete, restart your computer.