I did run the injector as admin, and it can't be DLL problem, as I've tested both injectors (TheCamels8 and the other) with my new DLL and another DLL that is downloadable from the forums (credits: TGH Zero)...
Going to check it out again today. I just decided I don't want to download pre-made hacks as I won't learn anything from it...
Next Step: Going to test different injectors
Update: Tested several (if not all) injectors... and it fails to inject, so I can pretty much conclude its a Win 7 64bits problem. In one of the injectors it said it would close the injector because Flash.ocx was not supported by this version...