Google links are fine, every time I click on the "next page" link of search results in yahoo or a link to a news story on yahoo I get these f'ing "scanning your computer" websites popping up. wtf! Any ideas?
You can be sure it's not the Yahoo site if it's happening regularly. You'll either have to take your computer in or get to work http://www.malwarebytes.org/mbam.php
This finds and kills virii and malware that no other program - none - that I've tried, does: http://www.emsisoft.com/en/software/free/ Even the free version (linked above) allowed me to clean up many computers of family and friends when all else failed, and saved me the pain of using hijackthis. BWT, Yahoo sites are festering with malware.