Help Please

A search engine caled "heretofind.com" has installed itself onto my comp. I use aol but I can only access sites that are on my favourties, IE doesn't work either. I can't get on any other sites because heretofind.com comes up instead. How do I get rid of this as it is really annoying and I need to use search engines for college work, but I can't at the moment because of heretofind.com.

I read your thread that you must read before you ask for support, but on one of the steps where you have to disable "network security service" or "workstation netlogon service" I couldn't find either. I found something called "workstation" though. I have windows XP.

Any help appreciated.