Cannot get rid of a malware

I recently stated to get the following: when I do search using Safari (Google is my default), I get google for a second and then it is switched to Ask.com, I click the back button and have yahoo.com, etc. It is very annoying. My computer revealed a malware and I cleaned it. Now I only have ask.com, but I cannot delete it.

I see a strange process being active and I cannot find it in the system. It is called EarthwormJim1.

Any help, advice is appreciated. I need to get rid of that thing...