Conclusion: A really good story but spoilt by the twitchy graphics and bizarre unwanted slomo antics. Somebody put a lot into the game but it is badly flawed. I have an AMD Phenom 9699 Quad Core running two gigs of memory and a Radeon HD3870 Graphics Card. This old game brought my PC to its knees. Not an easy trick .
Conclusion: I run a well-maintained PC with Athlon 64 4400+, 2GB memory and NVidia GeForce 7800 GT card. This game got as far as the opening sequence but could not move my shuttle from its starting position underneath the alien craft in order to get to the orbiting space station.