blekko.com redirect

[fbclements]

i have a blekko.com redirect in my browser. Tried to get rid of it with avast pro for MAC. it doesn't detect it. Can somebody help me to get rid of this annoying trojan/ virus

[cool jay]

Hi mother in law has the same Blekko search engine hi jacker computer runs slow Avast missed this one.
Been on the Kaspersky site and Norton this is a common problem over the last week or so.
Others have re formatted rather long way to remove.