First dont over react it may be as simple as a codec problem with the film or it may just be the film itself.
Does the computer work ok except for the divx player, have you tried watching a differant movie ?
Pink DivX is most likely a codec problem, as mactronix said. I've had the infamous "Pink DivX" before and fixed it w/ a codec pack, and I believe I also turned off video hardware accelerations in my graphics options. It's a pain, but it worked for me.