This is a very handy tool that every Windows Admin should have in their repertoire:
http://www.microsoftstore.com/store/msusa/html/pbPage.Help_Win7_usbdvd_dwnTool#installation
This little software program allows you to take any of the operating system ISO files mentioned above and convert them into a bootable flash drive from which you can install windows. Handy on any workstation/server/laptop that either has a non-functional DVD drive or just doesn’t have a drive (which is the case with many newer laptops).
A good set of instructions for using the tool can be found here: