ProBox HDF-SU2 ext HD enclosure not seen by Windows 7

Arfer

TS Rookie
Hi, a friend of mine has dropped off a Mac HD to recover some pictures for him. He supplied the HD and a ProBox HDF-SU2. This I would think to be plug and play but no matter what I do including swapping to known good USB sockets the ext dive is not being seen. Windows is not even offering to install a driver for the ProBox HDF-SU2. Any help gratefully received. TIA