gameguard sux. apple sux. gameguard in a vm on an apple sux large monkey turds.
virtual machines are emulated PCs not 'real' PCs. some things with low level components like that gameguard rootkit demands a real physical PC or exztremely good VM emulation.
Frankly I'm surprised you managed to run rohan this long without gg giving you grief on that. if your mac runs on an intel processor and its bios lets you enable intel's virtual machine hardware extensions (its an Apple so I am not expecting it to give you that level of control over your hardware) be sure to enable that. a lot of motherboard makers leave that option disabled by default because they don't expect most people to use virtual machines on their systems (a trend that is changing).