Microsoft Visual C++ 2008 Redistributable (VC++ 9.0) is a set of libraries enabling Windows to run many applications created with Microsoft's development tools. These libraries are needed so that an application written with Visual C++ 2008 can be run on a user's system that does not have Microsoft's development tools in place. Lack of the described library is usually manifested by an error message announcing that the application cannot find the MSVCR90.dll file.

Some programs already during installation check if VC++ libraries are present in the system and offer automatic installation. Often, however, it should be done on its own. Once installed, VC+++ libraries can be used by all applications on your system that need them.

So there is no need to install them separately for each program that requires them. VC++ libraries are available in 32-bit (x86) and 64-bit (x64) versions. However, it does not matter what version of the operating system we have.

The decisive factor is the architecture of the application for which we install the library package. So if you run a 32-bit application on a 64-bit system, you should choose 32-bit libraries.