While in age of mythology I changed the screen resolution. Changed resolution within the game not windows. Now I get "mode not supported”. I tried deleting with the games uninstall file. After rebooting I still get mode not supported. Last time I ran age of empire III, the same thing happened. The solution was to find 2 files that remain even after deleting game. Could age of mythology have done the same thing?
It might have left some registry files behind, I know a few games that store the resolution there. I use this: CCleaner - Optimization and Cleaning - Free Download Try uninstalling again, then run the registry cleaner. Be a bit careful when deleting entries. I would start out just selecting applications, installer, and obsolete software. It's never broken anything on my computer, I still backup my registry first, just in case :). Run regedit and click file and then export.