Try this repair option:

1. Open Word and click the Open folder (Office Button, Open)
2. Browse to the location where the file is located and select the file
3. Click the down arrow next to the Open button in the dialog box and select "Open and Repair"

Are you subscribed to any rss news feeds? That error looks like its related to a webpage parsing error.

Also check the Startup folder in the Programs list on the Start Menu and delete anything referencing Word.