What changed since you installed it?
Are you trying a new script? Did you modify the AI_Soldier script?
Have you tried a file verify and then a reboot of your machine?
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.