The Microsoft Visual C++ 2008 SP1 Redistributable Package (x6 & x864) installs runtime components of Visual C++ Libraries required to run 64-bit and 32-bit applications developed with Visual C++ SP1 on a computer that does not have Visual C++ 2008 SP1 installed. NOTE: This will install both the x86 and x64 versions on a 64bit OS. the x86 version will only be installed on 32bit OS's