Chrome hijacked by yahoo genio

This somehow got into my google chrome and it does matter what I try I cannot get rid of it.  I tried basic solutions on the web and used both norton full scan and the special norton eraser tool that really goes after things.  Please advise as even multiple suggested solutions and tools have been to no avail.

Screenshot of Yahoo.Genieo.com can be found here

http://blog.teesupport.com/hijacked-by-yahoo-genieo-com-virus-step-by-step-yahoo-genieo-com-manual-removal/

mine looks precisely like that and has now migrated onto 3 machines.  Grrrr.

thanks in advance