Language pack install

> I downloaded the spanish language pack for 5744 from the connect site, but
> for the life of me, I can't figure out how to install it.
>
> I go to display language in control panel, click on install, uninstall
> languages, browse to the cab file and it says: No Language packs found. So,
> I completely extracted the entire 400+mb cab file into it's own directory....
> same result, no language packs found.
>
> If someone could tell me what to do with the .cab file once I have it, I
> would truly appreciate it.
>
> Thanks!