There's some information about this
here. Also, on the Windows 7 games thread in this forum, it says:
Uncle Reg reports that the CD version of the game (North American version published by The Adventure Company) loaded and played on 64-bit Windows 7 with no problem, though he has not played much of it. The DVD version (UK version published by Digital Jesters) will not play at all on 64-bit Windows 7 because it used the old version of StarForce copy "protection" that doesn't work with Windows 7.