isearch omiga.com hijacker

My IE homepage has been hijacked by http://isearch.omiga-plusdotcom and I have spent a day and a half trying to get rid of it!!! I have upgraded avast from the free to the internet security version and it is still there. Please help - I am going nuts trying to find a solution.

Attach your basic logs. (MBAM, FRST and aswMBR…!!)
Instructions: https://forum.avast.com/index.php?topic=53253.0

Monitoring!