Injected correctly, not working?

Hey guys, I've been having a problem ever since 2 nights ago. Ok, so I have injected hacks into games before. Project Blackout, OP7, Combat Arms, and they were all fairly easy. Well, I thought I'd give CoD4 a try. Turns out it was harder than I thought it would be. I'm just going to give an order of events that I do in order to get my hacks working.

1. I open up PerX as an Administrator
2. I select the correct .dll and the process target is set to "iw3mp.exe" (no quotes)
3. I then proceed to opening CoD4 as an Admin as well (from both a shortcut or the main directory)
4. I enter the game, only to find out that pressing my hotkeys do not make any menus appear.

I have looked on the help page for similar problems, but none of the suggestions have worked. My CoD4 is fully patched, and I have PerX as well as the .dll from http://www.mpgh.net/forum/142-call-d...-4-aimbot.html
So, to wrap it up in a short, clean sentence: Although I have injected correctly, my menus and hotkeys are unresponsive and do not work. Any help or comments are appreciated.