Error with vcredist_x86

I'm having some difficulty in getting Rhino 4 SR9 + GH 9 to load. I've had success with following the other threads regarding .NET 3.5 and vcredist_x86 installation issues on one of my computers but, not with my desktop rebuild. When trying to download and install the vcredist_x86 file I get the following messages. See attached images (in sequence) runtime problem 01 - 03.

Regarding the 3rd image, suggesting that an older version of MS Visual C++ 2005 "cannot" be removed suggest that I uninstall whatever version is there currently?

I'm using W7 64bit SP1 and all of my folders are "unhidden". Any suggestions or comments on what might be my problem?

All the best,

Les