I agree with others. I think the security settings disallow installing new drivers and the controller on the HHKB is one that the computer has not seen before.
Ask IT guy to come log in as Admin and install for you.
Before you do this you may want to try going into Device Manager (if policy allows), select the unknown USB hub/device, and click the top button for uninstall or remove (depending on Win version). Restart, and try plugging in as admin.
Good luck.