Possible bug causing redirect of websites – happening on one machine onlyr

Hello,

Recently on my home computer I’ve had problems where certain random websites seem to be redirected to one of those annoying fake search pages. I thought it might be that the sites were hijacked but at work and on other machines the sites appear fine. Plus it’s not my website, and it’s just happened randomly to several websites I’ve tried to visit. Any ideas on what might be causing this? I’m using both IE and Firefox and it’s happening on both.