MS C++ runtime error pls help!?

i'm having an error call MS C++ runtime error. i cant fix the problem. the error only occur in a certain program. when a run MU (an online game) it will appear after 5 - 10 mins of playing. after the error occured all other programs i ran, the graphics will be distorted. pls help! ive been looking for solution for 3 weeks. pls help...