Do you mean the favorites of your IE web browser? The folder of favorites is located in "C:\Documents and Settings\Administrator\Favorites" by default. It could have probably been trashed during your reinstallation. You may refer to some data recovery software like Handy Recovery or Final Data to retrieve the data. However, since new data has been written on the place where your favorites data is lost, I am afraid the successful rate is very low..But it is worth a try.