I had a similar problem upon installing Avast 2014. With Avast online security add-ons enabled I could call up IE9 and type in a search but as soon as I clicked on a website link IE9 closed down. Disabling the add-ons let me use IE9 as normal. I use Linkstash to shortcut websites and selecting a site with it when the add-ons were enabled did not cause a problem. I submitted a support ticket and have been told to uninstall and reinstall Avast 2014.