HelpHacks Not Working?

Hey Just wondering every time I use hacks the game crashes... I've used the portal injector, perX and a few others and still the game crashes.. I use differn't hacks like the skaters hack and the other ones marked as undetected... I've also tried the ByteCipher and still none of these work... Anyone care to help tell me what's wrong? Please?

use Alessandro hacks and run the injecter as admin and what OS system is its windows xp most hack dont work for xp