If you have UnleashX as a dashboard (possibly others as well) there is a file explorer --- you can burn the emulators to either a DVD or a CD-RW (if your DVD drive will read CD-R you could use those too), put the disc in, then go to the File Explorer and access the D:/ drive which would be the DVD drive. From here you could copy the emulators to an emulators folder (or APPS if your dashboard isn't set up to look for an Emulators directory).
There is always a folder inside of the emulators folder called Roms which is pretty obviously where the roms go. There might be a file inside that folder called "ROMS GO HERE" which you should delete... that's just a reminder message.
Another way, which will spare you from having to burn a disc, is by connecting the Xbox to your network and using an FTP application to transfer the emulators to the correct directory.
Full guide to networking ---> http://dwl.xbox-scene.com/~xbox/xbox-scene...ng_the_xbox.pdf
If you don't have FTP software you should be able to use internet explorer. Here is the guide for that ---> http://xbox-scene.com/articles/ftp-ie.php