-you'll need to "extract" the contents of that ISO file. I'd use Alcohol or Daemon Tools to mount the ISO image as a virtual drive on your system to accomplish this. (Google search for them if you don't know what this means)
-any file 50-100mb will do...just rename it to 1.bin
-if you can't find a file of that size on your system you'll find a program in the ownload section to create one...just search for "dummy"
-burn the extracted ISO files and the dummy file to a DVDRW (my XBOX won't read any CDRW's so youre milage may vary)
OR
it may be that that ISO file you grabbed has a dummy file on it (doubtful) already and you just have to burn the ISO. I use DVD Decrypter (it's free, do a Google search for it) to burn my ISO's.
FINALLY - to quote from the link I gave you:
"Boot the xbox with it and Press A (for Pal) or B (for NTSC)
Then reboot the xbox and the video should be back.
If not try to boot the disc again and now press B if you pressed A first or the other way around. (You get it i hope...)"
I'll assume you weren't asking someone to send you a 50-100mb file!