Start there first. Second link is to download the ISO. You would would a program such as ImgBurn to burn that ISO to a CD. Many of these tools on the UBCD can destroy or corrupt data so warned, make sure you know what you are doing before doing it.
Visit the UBCD Wiki: http://wiki.ultimatebootcd.com
Please check your UBCD
ISO MD5 Hash Sum
; May prevent issues later on by not having an exact copy.
Currently Working on Common Issues and Repair Tips
on the Wiki.