I too just built up a new computer - Quad core, 2.4GHz, 2GB 800MHz RAM, adn an ATi Radion HD 3850 Video card with 256MB, XP SP2.
The demo wouldn't play at all - it loaded and even the intro was at like 1 frame per 2 seconds. Couldn't even exit - had to kill it.
Any idea what could be wrong? What video card are you guys using?
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