Did you happen to download the windows 7 upgrade from digitalriver.com.  This would be the $29.99 edition.

If you did get it, it downloads, then expands a TON of files.  If you want burn this to a DVD then you are going to need to do the following:

First download  oscdimg.zip.

THEN run this crazy command. 

This command will make an ISO for you.  Of course, replace the path with the correct path to the etfsboot.com and the directory where the files sit.

Oscdimg.exe –u2 –b”C:\Users\PUTUSERNAMEHERE\Desktop\expandedSetup\boot\etfsboot.com” –h “C:\Users\PUTUSERNAMEHERE\Desktop\expandedSetup” C:\WIN7.ISO

I found this information at

http://windows7forums.com/windows-7-installation-upgrade/23049-uk-student-download-version-2.html#post88606