As the title suggests, whatever I try (various injectors, various cleaners, various hacks etc.) will not work!

I used to use this site alot but since BF3 came out I've been hammering that alot (clean). Now I come back to it and reinstalled from scratch and all that, and nothing will work. I see people in the threads that say it works but mine just won't? Is it something I'm doing?

Help please, if you can! And thanks in advance.