Since so many people apparently need this answered, why not?
These are both for Windows Vista. If anybody has the solution for Windows XP, feel free to post it here.
Here are two explanations to get the hack to work, first mine:
User Account Control - Wikipedia, the free encyclopedia
Also, my computer becomes unresponsive to the mouse when I close Combat Arms because of the hack - forcing me to manually shut down the computer. If you also have this problem, press the "Insert" key before exiting the game, freezing Combat Arms. From there, press the Windows key to bring up the bottom bar, right-click on the Combat Arms tab, and close it.