I have 64 bit windows 7.
Right click your injector, click run as administrator, click the yes in the popup window
run combat arms as admin (not sure if needed but i do anyways)
I use perx and it works perfectly fine.
Also, all my hacks are in a folder named combat arms that is in the exception list of my antiviruses.
If it says something about d3d, download that file at the .missing dll thread.