I wouldn't use it via VM. Either use steam for OSX or bootcamp. What video card is in that machine?
Intel HD Graphics 3000:
Chipset Model: Intel HD Graphics 3000
Type: GPU
Bus: Built-In
VRAM (Total): 384 MB
Vendor: Intel (0x8086)
Device ID: 0x0126
Revision ID: 0x0009
Displays:
Color LCD:
Resolution: 1280 x 800
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
LCD1735NXM:
Resolution: 1280 x 1024 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Display Serial Number: 53532423TA
Mirror: Off
Online: Yes
Rotation: Supported
Adapter Type: Analog VGA Or Analog Over DVI-I
Adapter Firmware Version: 1.00