Try removing that whole folder and then redownloading it again (if you don't have a backup of it) and then put that stuff back in the C drive under the Q folder and try it again. I just had that same problem tonight trying to flash a Q and got the same error you were getting on several machines. I just deleted that folder and restored it with the zip backup I keep.
I have no clue what happened or what caused it but that worked for me. I hope this helps you out. If not, I guess it is back to the drawing board...