Command and Conquer Red Alert 2/ Yuri's Revenge

on my red alert 2, ill be in my gameplay and it will go about ten minutes in the game and all of my units die, all of my building blow up and I lose the game, but I will go to restart the mission and it does the same thing again but instantly. Also the yuri's revenge that is with it will play but constanly lags and then freezes my pc and I have to completely shut my pc off in order to fix the situation. So far ive had two different cmputers do this. if anyone has any tips you can reach my email...... [edit: email address removed], thank you.....