any one with the hijack this trojan problem

[golden69_ca]

i have been geting this message when i shut down that a file wants to be renamed from host to hostsagf . i have tracked down that its linked to a trojan and ads gone but have yet been able to fix it . if any one has had this broblem and fixed it help would be loved . it sure slowes the computer down and screws with u when your online .

thanx aaron