This Site, http:// abnow.com is keep getting back!

Please help, Ik have a trojan zeroaccess!kmem and its not removable bij norton internet security and neither bij norton 360. Everytime i go to google and click a link a go to hxxp://abnow.com (xx should be tt) and I'm getting really tired and desperate of this.

 

I tried a lot of (anti)spyware programs but nothing helped. I have this problem for two weeks now. 

 

please help me