One way you can find out:
If you have Steam: Open up Steam. Right-click on Earth's Special Forces and click on create icon to desktop. Go to your desktop and right click on the Earth's Special Forces icon and choose properties. In the line titled Target; after the second quote then add the line
Run Earth's Special Forces from the desktop shortcut and play the game until it freezes, then look at the top of the screen to see if any errors show.
If you do not have steam: Right click on Earth's Special Forces icon and choose properties. In the line titled Target; after the second quote then add the line
Run Earth's Special Forces from the desktop shortcut and play the game until it freezes, then look at the top of the screen to see if any errors show.
That usually helps me, if you find the error then ask on these message boards.