Check out this link for an excellent tutorial on how to create a bootable live Windows CD/DVD.
Why would you want a bootable Windows CD/DVD? It's in case your system crashes and you need to be able to access your files on the hard drive. This has actually happened to me twice in the past month. Using your Windows install disk to repair your installation is always an option, but at 39+ minutes it is really a pain.
Here is some information from the web page:
What is BartPE and PE Builder?
Bart's PE Builder helps you build a "BartPE" (Bart Preinstalled Environment) bootable Windows CD-Rom or DVD from the original Windows XP or Windows Server 2003 installation/setup CD, very suitable for PC maintenance tasks.
It will give you a complete Win32 environment with network support, a graphical user interface (800x600) and FAT/NTFS/CDFS filesystem support. Very handy for burn-in testing systems with no OS, rescuing files to a network share, virus scan and so on.
This will replace any Dos bootdisk in no time!