This sorted it. I was using an older installation which I had just copied the directory of. I have been doing it this way since Windows 7 and through 8-8.1 so was surprised it did not work in Windows 10. Anyway, now sorted, thanks.
Hi guys, I have installed Windows 10 on both my main PC and a secondary laptop and neither of them will start Red Alert. You run the program, it starts the process and leaves the process running, but never actually loads up. It uses CPU still. Compatibility mode does not work. Annoyed how every time MS release a new Windows version, they manage to break my traditionally favourite game.