Hi, I'm afraid I don't know what you mean by "a short processed AVG".
As to the in-game menu, if you read the description right here on this page, you will see a "Controls" section. Press Esc to access the in-game menu, where you can save your game and then load it from the main menu, and Alt+Enter (or use winsetup.exe) to toggle between fullscreen and windowed mode.