You must place mameboy executable and roms folder in the exact right spot in your directory structure.

It must be at either:

storage card/mameboy/mameboy.exe
storage card/mameboy/roms/dkongjr.zip

or

program files/mameboy/mameboy.exe
program files/mameboy/roms/dkongjr.zip

> I just install MameBoy on my EM505, I put dkongjr.zip in my Rom directory but it
> doesnt appears on my game list, what I have to do ??
>