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Because I've heard about this rootkit business and the malware, and I'm not sure what other nasty surprises will be waiting for me if I DO install it.
Also, I've heard Bioshock is the first game to use the Unreal 3 Engine, and my system is only a measly Athlon 64 2Ghz+ machine with 1Gb of RAM and perhaps an above-average 3D card - should I risk it?