When I am searching, every time I click on a link I am redirected to other websites, always different ones. I have Avast and Comodo, but neither finds any virus. I just followed the advice on another thread here and downloaded Hijack This. It found a long list of files when it scanned, but I don't know what to do with the results. Thanks!

I did download Hijack This, but I don't know how to assess its findings. I am able to use my computer to access websites I want, even searching, if I use the back button to leave the site I was redirected to. Some more questions: Is it worth just removing everything from my computer and starting again? Is it possible that a virus would also infect a network drive (Simpleshare) with files stored on it (but not used for internet)? Thanks!