When an installation package contained any of the following prerequisites, the redistributables did not get installed on 64 Bit Operating systems
Microsoft Visual C++ 2008 SP1 Redistributable Package (x86).prq
Microsoft Visual C++ 2010 Redistributable Package (x86).prq
Microsoft Visual C++ 2010 RTM Redistributable MFC Security Update KB2467173 (x86).prq
Microsoft Visual C++ 2010 SP1 Redistributable Package (x86).prq