Can't load Killswitch at all Help please?

This is my first post so apologies for any errors;
My OS is XP, I have a Comodo firewall and avast AV, I also have CCcleaner and malwarebytes. I downloaded CCE yet I couldn’t find killswitch. I found it through Search, but when I click on Run it says C:\Documents…KillSwitch.exe is not a valid Win32 application
Can anyone advise please, as you can tell I’m no computer geek :embarassed:

Can you see that if you downloaded the 64 bits version instead of the 32 bits version?