I have noted a strange "bug/conflict" where if Civilization 4: Colonization and Empire Earth II are installed on the same computer, neither of the games will boot up at all. I have tried in the past to update both of them, with no improvement. (Although it WAS a long while ago) Even if one of the games is uninstalled fully, the other continues not to be about to work. However if both are fully uninstalled and then only one of them is reinstalled, the game installed will function normally. Its been a while since I've reciprocated this however. So my details are a little sparse.