Hi Tech,
You somehow got on the wrong foot here. Freefixer was not a False Positive found by avast but by Prevx, I'd never had avast alarm about this tool, and I have it on my comp since day one. There are some security programs that are more FP prone than others: a-squared is/was notorious, but you can have a FP or many in this version of a-squared, while the next update is without these altogether. Some av programs are notorious because of heuristics, DrWeb flagged RUBotted recently and they have a whole range of so-called riskware they flag, very unpractical as you have installed them yourselves. Avast does not have a very bad FP reputation, but can misinterpret scripts. But who or what is perfect in this world? As a rule of thumb always have this at the back of your mind when something is found, that you have to Google first, is this real or a False Positive? If you cannot make a decision come to this here forum and ask those that know,
polonus