Windows 7 install vs USB3.0

Hi all.
I picked up an Asrock Beebox n3000 for my fiance's mother and have found myself in quite a pickle. Long story short I'm trying to re-use her old windows 7 license and I'm having trouble using a mouse and keyboard when loading Windows 7 since all 3 usb ports are superspeed usb3.0 ports from intel. I found a nifty looking little article (here) but I run into a problem when I get to the command prompt entries. I run the first command: "dism /mount-wim /wimfile:boot.wim /index:2 /mountdir:mount" but receive the following error:
This doesn't look a whole like "operation completed successfully" as he achieved, so I took the error code to google and got 0 results. I'm well beyond my comfort zone with these commands and I'm hoping someone here knows what's going on. Also I noticed that he's got a different version of dism but I'm not sure how to update that, or if that is even what is causing the problem.

You misspelled the argument, it needs to be '/wimfile'. You put /wmfile

Oh my lord, the lack of sleep has caught up with me. Thanks mate!

Haha, np.

Got all those commands in properly and verified with the intel usb driver the author provided, getting the same issue I had before though. I'm going to try it again with the latest download from asrock's website this time.

Protip to anyone else trying this method, close your explorer windows before running the commands or else you might not be able to successfully dismount the volumes. I wish the author had mentioned that before all of this failed dismount troubleshooting this evening.