The only other suggestion I received was that I should uninstall and reinstall the game after I cleaned it with CCleaner but since my brother lost the disc that isn't an option for me. I have looked up and there are suggestions of changing CD Keys, so through regedit.exe I changed it and tried it and changed it back and tried it again and neither worked. I can load previous save games that are already longer than 3 and a half minutes but it gets boring playing the same games over and over. I am getting the problem where the game thinks it is a pirated copy and ends the game after the first 3 and a half minutes. It has worked for about a year, but recently it quit working.
My brother lost the disc 2 years ago so I had to use Daemon Tools Lite to mount an image and start the game that way.
I bought Lord of the Rings Battle for Middle Earth Anthology, containing the first game, the second, and the expansion Rise of the Witch-King, quite a few years back.