If I remember correctly from a previous thread, there are a couple of hidden files on the USB hard drive. Make sure you have enabled Windows to see hidden files before you copy everything over.

I found that if you copy the contents of the USB drive to a different drive and put it under its own sub-folder, then you can't install from that sub-folder. However, with XP and Vista, you can use the "subst" command to substitute a drive letter for that sub-folder and then install it. For Windows 7, the "subst" command wouldn't work for me, however. So instead I just "shared" the subfolder and then mapped a network drive to that sharename.

John

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