I played on a computer running Windows XP Pro SP2 with 2gb memory, Nvidia Geforce 8500GT with 512mb, AMD Athlon 64 3800+, and the graphic setting all to medium and it runs very smooth till it get to many this moving, it starts to go a little bit slowly but for the rest it was OK. So many people upgraded their PC for nothing only with a Geforce 8800 it will work better. Do not Always believe what the tell you. The game itself is very good, only the part with the aliens, i wait already for CRYSIS II ????????