Szia Pal,
It must be that 'Load hive' is a newer functionality, from a later Windows version. Not sure whether that would work (if the registry binary format is not changed - it should), can you try to attach the vmdk to a newer Windows (7 has it for sure, 2k8 perhaps too)?
I don't know the driver name, but if you manage to attach the registry, searching for 'perc h700' in it may get you some hint.
Crossing fingers,
Plamen