Once you have a downloaded an iso from the links here
Code:
http://www.world-of-satellite.com/showthread.php?5600-Windows-7-ISO-%E2%80%93-Official-Direct-microsoft-Download-Links
Run the IE.CFG removal utility from here
to use the utility point it to the ISO. The process can be reversed and does not effect the MD5 checksum.
when you use the cd instead of it installing windows 7 professional you get a dropdown to install which version you want
windows 7 enterprise, ultimate professional etc... etc....
So you will only need to download 2 iso's 1 64bit and 1 x86.Then you will every version of windows7 on 2 iso's.