I played with all the configuration settings in GOG set full screen to false 0x0 resolution and so forth.

The DOSBOX launcher looks like it goes to the correct size I set it but the second the game launches from there it goes to full screen.

I can't alt + enter or even pull up the dosbox menu. It looks like its going into some kind of custom launcher or something from here.

Anyone been able to resolve this issue? I can't get my mouse to lock into the window either so its quite annoying.

Need a full description of your computer and skyrim setup including mods plus how many skyrim editions you have installed to be of any help.