Reply To: mafia 2 injector7 without virus (Need Link)
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in addition to what johncena said , dont forget to go in avira configuration, advanced, Real time protection, research, exeption and add the mafia2 folder in the exeption list.
put avira in game mode as well with automatic allow before lauching injector.
and see if you still have the trouble, invalid Windows Application, then you can take avira out of the equation, it is something else.
are you on 64 bit, xp 32bit is fine with injector 6 or 7 with avira