Your CPU is probably alright though you should really have been more specific about the model.
4GB RAM just doesn't cut it anymore, after a couple hours playing my system is sitting at 5.2GB used with only TOR and firefox running.
Your GPUs were poor when they came out and are just abysmal now, SLI will be of no use to you at all since there are no profiles released for this game yet.
HDD is probably a first gen WD raptor? Not great but should be acceptable for now.
So considering all that I'd say in order of importance you need a new GPU then 2-4GB more ram and possibly a new 7200RPM HDD.