It isn't yahoo, it is something attached to your browser, I changed to fox fire and others and had the same problem so I contacted Microsoft, and told them what was going on with Internet explorer, they directed me to told me to run the FULL SERVICE Scan, it takes a while, make sure you restart your computer after the scan is done, if this doesn't work send an email to this address stating that yahoo keeps redirecting you to sites you don't want to go to when you try to search a specific topic, They can help you from there if the scan doesn't help. It fixed my computer. Hope this helps