There is a dam bug going around that adds itself into a google search engine on the left side. It looks like normal ads but on the bottom it states "ads by SAH" This is part of the website www.seekandexplore.com. Just a basic search engine trying to get more hits! Some how it can crawl through even if you have ad blockers, virus scaners.
The bug is called win32.BHO.ajv - its located in your c:/windows folder under tinybho.dll. It also attacks your registry and adds browser helper. It's a new adware that is annoying. Your anti-virus should now pick it up. Update for the latest defenitions then run a scan.