Hi,
I installed this on my 860IS the other day, no problems.
As mentioned cardtricks125.exe was part of the solution (makes the card bootable).
Looks like you have installed the files in the correct place, but I thought the filename was DISKBOOT.BIN, not DISKBOOT? Maybe you hide known file extensions but I doubt that is the case given the screen shot.
Once you've made the card bootable and have the files installed correctly, yoou need to set the write protect/lock switch on your card otherwise the software won't boot.
Anyway that's what worked for me.
Thanks,
Matt