I think you'll need to download a "third party helper" program. Check
www.cracks.am (sorry if linking that place is disallowed here). As for booting into DOS, just sit down at a computer and create an MS DOS startup disk (go into my computer, select the A: and go to file->format). There should be options there to format it and then make it a MS DOS disk.
However, I don't know what you'd do after you booted into DOS, never really encountered this problem.