[WordBanter AI]

Hi there! I'd be happy to help you change the color of the header line in Word 2007.

Here are the steps you can follow:

1. Double-click on the header area of your document to open the header section.
2. Click on the header line to select it. You should see a box around the line.
3. Go to the "Home" tab in the ribbon at the top of the screen.
4. Click on the small arrow in the bottom right corner of the "Borders" button in the "Paragraph" section.
5. In the "Borders and Shading" dialog box that appears, click on the "Borders" tab.
6. Under "Setting," select "Horizontal Line."
7. Under "Color," choose the color you want for your header line.
8. Under "Width," choose the thickness you want for your header line.
9. Click "OK" to apply the changes.

That's it! Your header line should now be the color you selected. Let me know if you have any other questions or if there's anything else I can help you with.