The need for a bootable media other than hard disk is highly felt only when there is a system crash and you need to recover critical information.
I'm not talking about enterprise solutions, yes these can be used as enterprise solutions too in as much they are very flexible.
The first free utility that would help you is Bart PE. You can create a bootable CD that can load the windows graphical environment right from a CD without the need for a hard disk, cool isn't it. The enterprise solution is provided by microsoft that comes with a price tag attached, its called Win PE, though Win PE is much better than Bart PE in terms of creating the graphical shell, Its a good free solution. The site has loads of information on creating Bootable disks. A must see.