I'm runnig Unreal Gold on my netbook (Intel Atom 1,6GHz, Intel GMA 945, 1GB RAM, WinXP 32bit) an when it runs, it runs flawless in 1024x600 and maximum video settings.
Unfortunately sometimes it freezes completely and I don't know why. Trying to use the Win-Button, or Ctrl-Alt-Del to get back to Windows, results in a bluescreen and automatic reboot.
Is this a known problem? What could I do, to solve this?

Have you noticed a pattern to the crashes, like if you fire a certain weapon, anything like that?

No, nothing. For the first time it crashed about 1 minute after the story starts. At that point one has nothing! For the second time it crashed about 45 minutes after the beginning of the story mode. I didn't do anything at that moment, just running around.

Have you tried updating your GPU drivers? I don't know what Intel are like with supporting their graphics chipsets, but it might help. Also, have you noticed the netbook getting very warm when you're playing the game?