Your PC should run it fine. I have an Athlon 64 3700+, a 6800 GT, and 2 GB of RAM and I have my settings literally maxed out and it runs at a constant 50-60 FPS. Even with 1 GB of RAM you should be able to run it at very high settings. The demo always gave me problems as well by the way...the actual game runs MUCH better than the demo. The demo made my PC look really, really bad for some reason.
PS: Get used to the loading lag. My PC loads the levels pretty fast, but the game is notorious for having very long load times.
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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