Please be patient, PWizard and Caliber always produce trainers for every single major title to ever come out on the PC. Because GTA IV incorporates LIVE, the workaround process may take a little longer than expected, but you can be sure it's worth it. A few days wait won't kill you, perhaps you should play the game unmodified once?
Yes I totally agree with Chingy, this game is truly a masterpiece on security checks. Give the guys a couple of days to work on it!
-=}{ Cool ... Cold ... Calculated }{=-