Ok, I have had much success with this hack on XP. To make this still run on XP you need to follow these instructions.
Step 1: Make sure you have all your Virus protection software and any other 3rd party programs turned off.
Step 2: Byte cipher the .dll twice.
Step 3: Make sure Perx is renamed to something random and load the ciphered .dll onto it.
Step 4: Close Perx and make sure it is available for you to open quick.
Step 5: Start Combat Arms and wait for the two hackshield icons to go away then open Perx, it should auto inject then close itself.
Step 6: Profit!
Feel free to PM me if you have any other questions.
Please thank if this helped you!
This STILL works for XP users. Just follow the instructions here. If Perx doesn't work, try portal.