UBCD allows users to run floppy-based diagnostic tools from most CDROM drives on Intel-compatible machines, no operating system required. The cd includes many diagnostic utilities and can also be used to provide shared internet access or browse the web.
Site www.ultimatebootcd.com is dangerous. After trying to download the CD Panda found 4 trojans, all my browsers were corrupted and vosteron browse was installed without me wanting it. It cost me a day to repair my system.
Do NOT visit the url listed as the official website. It is overloaded with viral software. I consider myself a savvy user, but I had to restore my windows system from a restore point when I failed to make a legitimate download of UBCD from the site. It makes me worry about the safety of this current sourceforge download.