Here is the PIC tutorial, part 1:
Now the part 2( sorry for the bad quality ): DISABLE THE ANTI-VIRUS!!!
If you have vista, you have to run the hack 'As Admin' and also CA 'As Admin'. Just right click on the hack and click on, 'Run as Administrator'. When the hack opens up MPGH, make sure you're logged in.. don't exit the internet explorer or whichever net your using.
Then you do the same for CA.. right click and click, 'Run as Administartor'. Once you get into the game where it asks you for your CA account and password, you should see on the bottom left of the screen somethin sayin bout public MPGH hak.
If you see those letters then the hack worked, all you have to do it hit 'Delete' and a menu will come up.. hit the right arrow or enable the hack and left to disable. You can mix and match and use whichever you want.
Also, make sure when you unzip or unrar the files, that you make a seperate folder for the three files and place that folder in the Combat Arms folder.
See if that works..