Well, it was in Avast by default (like any other version of Avast in spanish, even the Free version), you can’t use it directly because you should pay for unlock it or use a license, only you can use it in the smart scan or use it’s own schedule in the options when is by default, but I don’t have scheduled the use of Grime Fighter).

But I need boot correctly if I should follow the tip, Grime Fighter intercepts the boot and put it’s own advertisement first.