Computer Freezes

Lately, I've had an urge to play SimCity 2000.

The thing is when I play, it's all fine until it randomly freezes up and nothing happens. No blue screen or anything. Not even a restart. I have to do it manually. I have tried setting the compatibility mode too, but that doesn't seem to work either.

I have Windows XP Home edition sp2

some maybe irrelevant specs:
Intel Celeron D 2.66 mhz
512MB RAM

another information:
When I install, the installation program says that I need 4096KB of RAM, and that I only have 2048KB. Any idea what this might mean, and if and how it is linked to my problem, and any way to fix this?

Thx

 

It means just what it says, you need more RAM.

 

What RAM is it talking about? I have 512MB, yet it says i only have 2048KB.

 

But... i always have at least 30MB free. I check constantly