Windows 7 - Install new language in Windows 7 Home Premium

I plan to buy a laptop that comes with Genuine Windows 7 Home Premium 64-bit. And I want to add another language for reading and typing (not to change the menu's language - MUI).

I'm currently use XP and I have an XP's CD. When I want to install a new language for reading and typing, I can easily insert XP's CD into my optical drive. But if I buy a laptop that come with an OS, I will have no CD.

So, how can I do it now? Thanks.

Windows 7 language packs are only available for computers that are running Windows 7 Ultimate or Windows 7 Enterprise.

source

Aren't that language packs for those who want to change the menu's language?

I just want to add input language. Is it impossible after all in Windows 7 Home Premium?


Edit : I found it, this is what I'm looking for. Add or change an input language.

It said "Applies to all editions of Windows 7".