Computer freezes and shuts down automatically

Hi,
I'm playing SimCity 4 and it looks like the CD is just fine but my mini mac keeps freezing up & then shuts down automatically. Computer meets system requirements of OS X 10 & up, Can it be the memory? If it is, can I get more virtual memory & how? Can it be something else? I know very little about my mini mac. Thanks for the help.

Guess the first question would be, how much memory does the Mini currently have? Below are the specification required to play the game:
Operating System: Mac OS X 10.2.3 or later
CPU Processor: PowerPC G3 or later
CPU Speed: 500MHz or faster
Memory: 256 MB or higher
Hard Disk Space: 2.4GB free disk space
Video Card (ATI): Radeon 7500 or better
Video Card (NVidia): GeForce2 MX or better
Video Memory (VRam): 32 MB or higher
Media Required: CD Drive
It should have at least these requirements, so you could try to reinstall the graphics drivers.

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