When I pick a topic on yahoo it redirects e to other serach engines . How do I disable this?

After i enter a topic to serach I obtain the normal list of sites to choose.When I look for a site them redirects me personally to an additional serach engine.How must disable this

Maybe you PC is infected that has a search direct virus or perhaps malware.

Revise and manage your anti-virus and anti-malware courses.Then acquire and go TDSSKiller.

http://support.kaspersky.com/faq/qid=208283363.