You need take a copy of UnleashX, rename it avalaunch.xbe, and put it at C:\avalaunch.xbe.
The BIOS should boot a game quite happily, so if you can't boot an original game then your DVD drive is faulty. Unfortunately you can't fix your Xbox with a broken DVD drive, so if this is the case then you'll need to replace it (or borrow one temporarily from another Xbox) so you can boot with Slayers ot Frosty's Rescue Disc to get FTP access to install the dash.
This post has been edited by Heimdall: Oct 9 2010, 07:03 PM