If you have a modified xbox, just find the program "Auto Installer Deluxe", burn the iso to a disc (preferrably DvD-R) but CD-RW should work as well. From there, you'll see the options for installing dashboards...a couple clicks and you're done.
I found the auto installer deluxe on xbox-hq.com but i have to pay for it to get it do you know any links were i can get it for nothin. Cheeer's Brent
Didn't know you had to pay for it there...never heard that one but I can't provide any links directly as it would violate the forum rules. Your best bet is to search torrent sites. http://bt.xbox-sky.com should have it available.