just tried running the 64bit student download on my 64 bit win7 RC install:
win7 by *guyver1 on deviantART
If you get this error it means the download app didnt download the setup2.box file, get it here: http://www.mediafire.com/file/t0qmyw2twmd/setup2.box (Thanks Vazzan)
Follow this thread after you've unboxed the box files:
BUT use this syntax for the cmd prompt:
oscdimg -bC:\Users\USERNAME\Desktop\expandedSetup\boot\etfs boot.com -h -u2 -m -lWIN_EN_DVD C:\Users\USERNAME\Desktop\expandedSetup\ C:\7.iso
burn ISO to disc.
it works , now typing from retail \o/