I tried to run the nmap application on Windows and I get the error “MSVCR100.dll not found”.

This application has failed to start because MSVCR100.dll was not found. Re-installing the application may fix this problem.

Here is the screen shot:

What is MSVCR100.dll file?
MSVCR100.dll is the Microsoft Visual C++ Redistributable DLL file that provides programs compiled with Visual C++ a typical set of library functions required by C and C++ programs.

If you try to run a C++ program developed in Visual Studio 2010, this file is probably needed.

How to fix the missing MSVCR100.dll file?
It was actually really easy to fix this. Here is what I did. I Download and install Visual Studio 2010 c++ redistributable. That worked for most people. I don’t recommend you to download a single MSVCR100.dll file from the “DLL download website” to fix the problem. Downloading separate dll can be very dangerous and there is a great chance that you will end up with a virus.

If you need a copy of msvcrt.dll, it’s best to obtain it from its original, legitimate source:

Download from here:

http://www.microsoft.com/download/en/details.aspx?id=5555 (x86) or
http://www.microsoft.com/download/en/details.aspx?id=14632 (x64)

There is a way to change users from the command prompt without logging off Windows.

1) Press Ctrl+Alt+Del to launch Task Manager and look for a process in the list called explorer.exe.Click the End Process button.

2) Next, click on the file menu and choose New Task (Run…)

3) Enter “cmd” and hit enter to open the Command Prompt window

4) Inside the Command Prompt, use following syntax:

runas /user:username “explorer”

For example to switch to “Administrator” account, use the following command:

runas /user:Administrator “explorer”

Technorati Tags: Windows XP, RunAs