The version of OpenCodecs that I used is included in the application manager. The installer starts with no problems, but as soon as you start installing it, a Microsoft C++ Runtime Library error message box appears. And each time that you click the OK button, it seems to alternate it's focus from the setup program (opencodecs_0.85.17777.exe) to regvr32.exe.
It seems from initial observation as indicated by the log that the problem seems to be coming from MSVCR90.dll (which is bundled inside of the installer itself). The installer is supposed to be a 32/64-bit installer, so technically, it should be able to install without any problems.
SxS / ActCtx article: http://blog.tombowles.me.uk/2009/10/05/winsxs/