Hi,
1. When exactly do you get the message that Msvcr71.dll is missing?
The DLL file Msvcr71.dll belongs to the Microsoft Visual C Runtime library version 7.1 engine. This file is a core Windows component used by several Windows applications such as Microsoft Visual Studio.NET versions 2002, 2003 & 2005 and Microsoft Office version 2002 & 2003 that have Microsoft C++.NET. This DLL file is also used by a few other Microsoft and non-Microsoft applications.
Step1: Reinstall the Program.
If the error started appearing soon after you have installed a new application or device driver, then it is quite possible that the error is occurring due to problems in the installation. To rectify the error in this case, uninstall the software you installed and reinstall it.
For more information, you may refer the following link:
http://windows.microsoft.com/en-US/windows7/Uninstall-or-change-a-program
Note: It is important to be vigilant while you are installing and uninstalling applications from your computer. Never overwrite a shared DLL-when installing an application-unless you are sure that it is not used by any other application on your system. In the same way, never remove a DLL file-when uninstalling an application-unless you are certain that no other application on the system requires it.
Step 2: Update your PC.
You must always keep your PC up-to-date with the latest hot fixes, patches, security releases, and service packs released by your operating system, software applications, and device driver manufacturers. Keeping your system updated not only helps you in preventing several computer errors, but also helps you enhance the security of your system and improve its performance.