> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# I am trying to open nTop and there's an error with related to a *.dll

## Issue:

* Error message: "The code execution cannot proceed because VCRUNTIME140\_1.DLL was not found. Reinstalling the program may fix this problem."
* Crash in ucrtbase.dll (Exception code: 0xc0000409)

## Applies to:

* Windows 10 and 11
* Microsoft Visual Studio 2015, 2017, 2019

## Cause:

This Windows error message typically occurs because the Visual C++ redistributable files are missing or corrupt.

## Solution:

Get the latest versions of Microsoft Visual C++.

1. Visit the [Microsoft Support Site](https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist?view=msvc-170#visual-studio-2015-2017-2019-and-2022)
2. Browse the **Visual Studio 2015, 2017, and 2019** sections.
3. Download **x64: vc\_redist.x64.exe**
4. Double-click to run the program and install the files.

## Keywords:

*windows error update install run visual studio microsoft VCRUNTIME140\_1.DLL runtime vc dll visual studio time vcruntime 140*