Windows 7: Installing foreign language software on an English language win7 OS?

I have been installing Portuguese PhotoStory 3 on my windows 7 machine.

It install OK. I reboot. When I invoke Photostory 3 I am expecting to find it in Portuguese, ... but its still in English.
I used the official PhotoStory3Portuguese(Brazil).msi

Here's the question:
Even if I install the Portuguese version, does it still look at the OS language when invoked and say "well, your OS is in English so I am going to display in English" ?

(ps: I have the same issue on my XP machine...)

Could you please share a link for that msi-file, if that is possible?

That depends entirely on the individual program. :/

Some programs will take into account the current windows language settings and try to be clever about auto selecting the language for you.

Others allow you to switch languages within the program.

Still others may be a single language only and may or may not install a proper font.

Though I believe that the regular windows font can probably handle the special portugese characters fine. In this case I'd contact the program maker directly with this question...