For IE7 or IE8, you can delete the IE Addon with the follow method:
 
1. Open a new Internet Explore.
 
2. Go to Internet Explorer, and click the “Tools” button in the left of browser, and then click Manage Add-ons. 
 
3. Click Toolbars and Extensions 
 
4. Double Click the add-on you want to delete. In the pop up message box, you can click the Delete button in the bottom.
 
For IE6, you can delete the IE Addon with the follow method:
 
IE Toolbar > Options > General > Setting > View Object… 

Then delete the Edraw Viewer Component for Word.