Okay there's plenty of postings on instructions for installing language packs in Windows 7. Here's a couple of Microsoft's instructions:
http://support.microsoft.com/kb/972813
http://windows.microsoft.com/en-us/windows7/products/features/language-packs
All these instructions indicate the best way to obtain the language packs are through Microsoft Update that is built-in to Windows 7. These instructions are great, except for one missing step. When you get to the Microsoft Update window on a new machine, there isn't a link for Optional Updates, where the language packs reside.
To get there, you'll need to first click on the link that says "Check online for updates from Microsoft Update". After the machine checks for updates, it will show the link for the Optional Updates.
Hope this helps you save some time. Happy Computing.
