It has to be registered, not just installed.

>I modified my innosetup file, including the requisite foxpro runtime files.
>Normally this works without a hitch. But this time, when I ran the innosetup
>produced .exe file, I got an error:
>msvcr71.dll. Unable to register dll/ocx, GetProcAddress failed, error 127.
>I wonder what this means. The .ddl does exist, in the windows/system32/