> ## 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 VCOMP140.DLL

## Issue:

While trying to start nTop after installation, I saw the error message: "The code execution cannot proceed because VDCOMP140.DLL was not found. Reinstalling the program may fix this problem."

## Applies to:

* nTop
* Windows 10

## Cause:

This Windows error message generally occurs due to missing or corrupt Visual C++ redistributable files.

## Solution:

Get the latest versions of Microsoft Visual C++.

1. Visit the [Microsoft support site.](https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads)
2. Browse the **Visual Studio 2015, 2017, and 2019** sections.
3. Download **x64: vc\_redist.x64.exe**
4. Double-click to run the program to install the files.

## Keywords:

*help VDCOMP COMP Visual Studio DLL Error VDCOMP140 VCRUNTIME VCRUNTIME140\_1 runtime reinstall vcomp vrun VC VD 140*