Cant start rpcs3

i have downloaded the rpcs3 emulator and when i run rpcs3.exe it said: " This verison of this file is not compatible with the version of Windows you're running. Check your computer's system information to see whether you need an x86 (32-bit) or x64 (64-bit) verion of the program, and then contact the software publisher "

P/s: i'm using window 7 32bit ultimate