How to: Enable a Table for Full-Text Indexing (SQL Server Management Studio)
In SQL Server 2005, by default, all user-created databases are full-text enabled. Additionally, an individual table is automatically enabled for full-text indexing as soon as a full-text index is created on it and a column is added to the index. A table is automatically disabled for full-text indexing when the last column is dropped from its full-text index.
You can manually disable or reenable a table for full-text indexing by using SQL Server Management Studio.