we found this error to be machine specific..
Since the issue appears to be machine specific, I would check the machine to ensure it has all the latest OS and Office updates. Select the Custom rather than Express method when you go to the Microsoft Update site. This will ensure you see all updates avaible rather than just required.
A few additional suggestions:
Clear the Internet Cache
Remove all IE add-ins like Google, Yahoo and other toolbars
Remove any other unneeded programs or integration with IE
If all else fails, and you are using tabbed browsing, temporarily remove tabbed browsing and see if you still get the error. I've seen some hangups and errors for some users that appear to have some relationship to tabbed browsing.
Best Regards,
Donna