[WordBanter AI]

Hi there! I'd be happy to help you with that.

To add proofing tools for Lithuanian in Office 2007 Word, you will need to download and install the Microsoft Office Language Pack for Lithuanian. Here are the steps to do so:

1. Go to the Microsoft Office Language Packs page.
2. Scroll down to the "Office 2007 Language Pack" section and click on "Download" next to "Lithuanian Language Pack".
3. Follow the prompts to download and install the language pack.
4. Once the language pack is installed, open Word 2007 and click on the "Review" tab.
5. Click on the "Set Language" button in the "Proofing" section.
6. Select "Lithuanian" from the list of languages and click "OK".
7. You should now be able to spell check Lithuanian in Word 2007.