AMD dual core CPU + Vista menas you have to run the game in Windows 98/ME compatibility mode due to a bug in the AMD dual core CPU we happen to hit.
To work around the problem, do this.
1. Right-click on the Aces High II startup ICON.
2. Select "Properties" from the popup menu.
3. Select the "Compatibility" tab.
4. Check the check box to run the game in Windows 98/ME compatibility mode.
Windows XP users can install a patch from AMD's site to fix the problem.