This Language Packs will add following languages to your Windows 7 with SP1 (all editions):
Arabic (Saudi Arabia)
Bulgarian
Czech
Danish
German (Germany)
Greek
US English
Spanish
Estonian
Finnish
French
Hebrew
Croatian
Hungarian
Italian
Japanese - Standard
Korean
Lithuanian
Latvian
Norwegian
Dutch
Polish
Brazilian Portuguese
Portuguese
Romanian
Russian
Slovak
Slovenian
Serbian or Latin
Swedish
Thai
Turkish
Ukrainian
Simplified Chinese
Hong Kong Chinese.