i'm on vista 32 bit as well and have no problems. are you running Red Dragon Injector AND CA as admin? do you have CA set as the process? try using these settings: close when injected? yes; Dual Fuel? normal inject; How To Inject? auto; Inject Delay? 5. also, make sure you have the latest DirectX and .net framework installed, both can be found easily on google. another possibility is if you have X-fire. if you do have X-fire then close it completely because i've heard of X-fire causing problems with some hacks working. try these out and post results, if you're still having problems i'm sure myself or some other MPGHians will be glad to help. good luck.
**EDIT** also make sure you hit "Yes" on the popup before hackshield starts.