without the board (ICSP28 Adapter) connected at all...
can you connect the USB cable from your computer to the pickit3 unit? ...does the computer beep in recognition of the USB plug-n-play connection?
if it connects, the only thing i see in the device manager is one new entry for USB Input Device. It is treated as a Human Interface Device, apparently. there are 3 drivers loaded, all straight from windows.
if you then start the PICkit3 software, it takes about a 15+ seconds to load on my fairly fast machine.
the message box should then read "Found PICkit3, SN: BURxxxxx" etc.