I have the hacktool.rootkit virus and it keeps coming back

I ran Norton Antivirus and it keeps telling me that it has fixed the problem and to restart the computer. I do that and then I run Norton again and it the same thing. I have tried to read through some of the similar questions, but did not really understand them, I am not sure what a hijack log is and such. With step by step directions, I might be able to do it myself. I am running windows xp. I keep getting a pop up saying that "this link does not exist" but it comes up when I am not trying to click on anything. Any help would be GREATLY appreciated!!