Is there any chance you can get the version of the currently installed MSVC++ redistributible(s) on your computer? They're listed in programs and features in the control panel.
I originally had version 10.0.40219 installed in both 32 and 64 bit, which gave me the error. I uninstalled these versions just to get around the 9.2 beta2 install, which installed 10.0.30319.01.
OK, so that confirms it. The Pg installer needs to have an updated redist bundled when the final version is released, and needs to treate error 5100 as success.
I have updated the redist and modified the installer to not treat 5100 as error (we already handle 3010 return code properly).