For troubleshooting IE I try the IE SAFE MODE first.
But I may not be the best responder for this since for many years I've skipped IE in favor of other browsers since I don't want to risk my PC's contents to a rogue web page. So I use some other browser and add on Web Of Trust plus AdBlock Plus. In all the scans in the past few years I find an occasional cookie and nothing else.
Recently, the above mentioned features have started to display a 'stopped working' message after a short while of use. This has never happened before and I don't know what would cause this.
I am running Windows Vista and use Avast anti-virus with automatic updates and scans.