It says the script for Halo.ini is missing and when I tried jump, I'm frozen in midair. It worked in ARMA 2 Arrowhead and then when I finally decide to get Arma 2, the HALO thing is missing. Any help?

I tried doing bootcamp with parachutes, but I have no control over my character. He just appears out of thin air and already has his chute out without me having any control.