This is how to install language packs in windows 7 for SP 2010

1.        Download  SharePointLanguagePack.exe here is the link for English, you should download language of your country like French for France: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=046f16a9-4bce-4149-8679-223755560d54&displaylang=en

2.        Save it in the Desktop

3.        Click start, then my computer , than C drive, create folder named “SharePointLanguagePacks”

4.        Click start, then type run, then cmd

5.        Go to desktop using CD command

6.        Type the following “SharePointLanguagePack.exe /extract:C:\SharePointLanguagePacks”

7.        Go to C:\LanguagePacks\Files\Setup

8.        Open Config file add <Setting Id="AllowWindowsClientInstall" Value="True"/>

9.        Run setup

10.    Do the same for ServerLanguagePack.exe