Anti Spam Engine And How Do I Get Rid Of Search Engine Spam!?!?

How do I get rid of search engine spam!?!? - anti spam engine and

HELP PLEASE! I can not get rid of spam in search engines. I use the Internet Explorer Search and Yahoo. Every time I open a link that Yahoo is for me, makes me crazy on a fake site! I installed Norton Antivirus, Ad-Aware ran, ran Yahoo anti-spy, clean the disc, the history of the Internet and delete cookies, but not help! Someone please help me! I saw someone had a similar problem, and people respond to your IE again loaded only new, but delete everything. If it is for me, it would delete all files, documents, software, images, etc.? HELP PLEASE!