Windows 7 invalid MS-DOS function

Hey guys, im trying to install a copy of Windows 7 Professional x64, obtained through my university's MSDNAA program, on my desktop. Through research, and another thread on this forum i have attempted to make a USB disk to load the .iso onto the desktop, however when moving the files from the iso onto the flash disk it returns the error "Invalid MS-DOS Function" when trying to copy/move the install.wim, install_Windows7 PROFESSIONAL.clg, as well as the other .clg files. What can I do to remedy this issue and get this thing to install?

The computer im attempting to do this on is my Windows 7Pro x86 laptop.

Yes, I followed that exact tutorial to the tee. I got through the diskpart steps with no problems, but when I go to drag-n-drop the files from the iso to the prepared drive, it gets probably 3/4 the way done then a dialog pops up saying that install.wim is an invalid MS-DOS function with options to Try Again, Skip, or Cancel. If I press try again it comes up with the same error over and over. If I press skip, it will give me the same error for the various .clg files being transferred.

I just tried to copy the files from the iso to the flash disk using the cmd prompt, but it encounters the same error (Incorrect function).
The flash disk im using is an 8GB.

At the moment the .iso is mounted to a virtual drive (using MagicDisk), and I was just trying to copy them over by browsing the disk. However, in a moment of inspiration I tried just using WinRAR to extract the .iso directly to the flash disk, and it seemed to transfer the files without error. I'll have to see if it'll actually boot, but at least the files are there. Thanks for the help!

I would assume that it is, if it is an iso of the standard Win7 pro install disk. I had gotten Win7 x86, and XP x64 through the same channel and had no problems what-so-ever with them. I haven't been able to test the USB disk that I made last night yet to see if it will indeed run, as I'm out of town for the weekend.