Well, the injector should immediately close after the AVA mini screen comes up if that's what you mean. If it closes when that screen comes up and after you join a channel, press the home key in between your main keys and the small numberpad. If nothing comes up, close out of A.v.A and also close out of it in task manager (ctrl shift esc keys) and follow these steps and check for
1) Have you downloaded and installed the packages on page 1? Both x64 and x86
2) Have you made sure your anti virus is off? That is important as we'll.
3) Have you ran NeoX Public Hack.exe as administrator? Some problems arise if you don't..
4) After logging into AVA and joined a channel, have you pressed the home key?