To find and replace data in selected cells only in Excel 2007, follow these steps:

1. Select the cells where you want to find and replace data.
2. Press the Ctrl + H keys on your keyboard. This will open the Find and Replace dialog box.
3. In the Find and Replace dialog box, enter the data you want to find in the Find what field.
4. In the Replace with field, enter the data you want to replace the found data with.
5. Click on the Options button to expand the options.
6. Make sure the Within field is set to Sheet or Workbook, depending on your preference.
7. Select the Match case or Match entire cell contents options if necessary.
8. Click on the Find Next button to find the first occurrence of the data you want to replace.
9. If you want to replace the found data, click on the Replace button. If you want to skip it, click on the Find Next button again.
10. Repeat steps 8 and 9 until you have replaced all the data you want to replace.

That's it! You should now be able to find and replace data in selected cells only in Excel 2007.