Error to run PhysX SDK on Windows 7 32-bit

Hi, I am new to PhysX SDK. I just downloaded PhysX-3.2.3_PC_SDK_Core.exe and PhysX-3.2.4_PC_SDK_Core.exe from
But both of them failed to run with following error:

This version of PhysX-3.2.4_PC_SDK_Core.exe is not compatible with the version of Windows you’re running. Check your computer’s system information to see whether you need a x86 (32-bit) or x64 (64-bit) version of the program, and then contact the software publisher.

I am working on Windows 7 32-bit, is that PhysX SDK only work on 64-bit Windows please?