To remove the full text log you just need to follow these simple steps:
1. Go to the Object Explorer > expand server > expand databases > then expand the database that contains the full-text catalog you want to remove.
2. Expand Storage, and expand Full Text Catalogs.
3. Right-click the full-text catalog that you want to remove, and then select Delete.
4. In the Delete Objects dialog box, click OK.
Please go this one hopefully it may be helpful to you. http://www.sqlservercentral.com/Forums/Topic698295-324-1.aspx