Need more help with Dawn of War 1

No one has any ideas? :C

Well... I haven't played the game, but I do know that you can change the game config manually by altering the user config files (user.cfg) located in the game folder. Can't guarantee this method will work but it's worth a shot.
The config files are either (or both) located in steam/steamapps/your-game-folder, steam/userdata/random-number-that-matches-your-game/another-number/remote/user.cfg

If you open up the user.cfg file in a text editor (eg. notepad), then you should see a list of settings usually in some data form like 'r_fullscreen = yes'. Just change the value for whatever you need, although make sure it is valid for the game. Run your game and hopefully it should work. If it doesn't, perhaps someone else has a suggestion to make.