Are you 100% sure you have 32-bit? Because when I try to run hacks on my 64-bit I get the same problem as you.
You can check your OS by:
1. Click Start
2. Click Control Panel
3. Click Classic View on the left side of the window (if it isn't already on classic view)
4. Click System
5. Your OS will be on the window that opens up
(note: I don't know if XP follows these steps)