Adding a custom library to the Word 2007 library can improve the productivity of your users, and you can delete them when you no longer need Word 2007, as described in the following procedure:
Step 1th, open the Word 2007 window and switch to the Insert Ribbon. In the header and Footer group, click the Triangle button below the header button.
Step 2nd, in the open Word 2007 header Gallery, right-click the user-added custom library and click Organize and Delete on the shortcut menu, as shown in the figure.
Word 2007 Click the Organize and delete command
Step 3rd, open the Word 2007 Building Block Manager dialog box and click the Delete button. Click the Yes button in the Open Confirm Delete prompt box, and click the Close button, as shown in the figure.
Word 2007 Building Block Manager dialog box