help me out here with the hack

it says "Process ID Found: 5584 [Valkyrie] Injecting. Injection Failed"

and the hack don't work... my friend on ava just told me this n i tryed it. and

it dosen't work! and what do i do with at arrow key??? what do i press?

You start the AVA from ijjis reactor,
and when Avas little window pops up when it loads the GameGuard or Nprotect.
Press Inject, if it does not work then I do not know.
what is your operating system?
if you have Vista or Win7 try to run as admin <- right click on the Valkyrie and "run as admin".
if it does not work, your computer's idiot