It's a well known IE addon that shows related site - it tracks what you do and slows browsing down - and like most addons it's not without its bugs - I used it years ago and realised it was causing crashes - in short get rid of it.
My ISP recently advised me to download the new version of IE6 which I did. Since then, when I run Ad Aware, I get about 13 critical objects related to Alexa. I don't know if this is harmful spyware or what I should, if anything, do about it. I'm running windows 98. Any help would be appreciated!