I have never needed a special driver for my keyboards, under Windows XP, Windows 7, OS X and Linux.
The Mac just asks to press a couple of keys, confirm the layout, and all good.
Linux doesn't even bother with that - it just works.
Windows installs its own driver (some sort of generic keyboard driver, I think), and once it insisted on rebooting before it would let me use the keyboard, which is just silly.
There are drivers for the Mac for the HHKB Pro 2 to enable the special media keys.
Maybe try the keyboard/s in a different USB port, and/or a different computer. Also try a different USB cable.