On windows 7, I got a 4/3 screen resolution instead of my 16/9 laptop's
The resolution was fine on Vista but sux on 7...
The only solution I've found is to create a file named user.cfg in Mydocs/Mygames/AOM/Startup and to add these lines:
xres=1280
yres=800
Unfortunately, when you do it, you can't play on gameranger anymore :/
But I've not try on eso.