1. click start
2. click control panel
3. click classic view on left
4. double-click internet options
5. click delete files button
6. check delete all offline contents and click ok
7. click advanced tab
8. click restore defaults
9. uncheck enable third-party browser extensions (requires restart)
(At this moment the bad BHO should be temporarily disabled)
10. click apply and then ok
11. Can you successfully start IE without errors? If Yes, go to step5, otherwise go to step3