Re: Good old GPU trouble
You wrote that the graphics won't go above medium. Choki explained how to fix this (here). Choki's solution is to edit your preferences file rather than to delete it.
Here's how:-
1. Open your C:/Users/[your user name]/AppData/Roaming/The Creative Assembly/Empire/scripts folder
(Some of these folders are hidden by default, so some users might need to search online for 'how to reveal hidden folders in [your operating system]', for example 'how to reveal hidden folders in Windows 10'. You have been able to delete your preferences file, so that does not seem to be an issue here.)
2. Double-click on your preferences.empire_script.txt file, to open it
3. Find a line which says:-
gfx_video_memory 0; # gfx_video_memory <int>, Override available video memory (bytes) #
Edit this line so that it says:
gfx_video_memory 512000000; # gfx_video_memory <int>, Override available video memory (bytes) #
4. Save the file.
It should now be possible to start Empire Total War and to set the graphics to any setting.