Newjamesfod

Guys I need some help. Everytime I started RedAlert 1 with a skirmish game. It was fine with whatever I did. Scrolling with Keyboard, pressing H key, Ctrl+1, etc. But as soon as I moved my mouse. the screen froze and the music stopped. My os is win7 64 bit. Has anyone encountered this problem and how did you fix it? Plz help. Many thanks.