Solution: go to the 'Main' folder and open wolfconfig.cfg with Notepad, search for fullscreen option and set to 0, also set the resolution back to something safe, like 800圆00. If I set the resolution to something beyond my display limits, the game crashes and won't start. While in the game, the menus to setup the game work fine now - or will work fine after a proper setup and program restart - so here I setup all my preferences. Just start a new game and ESC to skip the intro, then save the game - the menus now work fine. The menus to setup the game are horribly slow on the main menu. Note: when I started the game, the fmv is jerky, just pressed ESC to skip.
Game works great on my Windows 10 laptop with integrated graphics, in widescreen and on max settings.
Readme in zip says to backup a few files, then just copy contents of zip into game directory.
Get the 'Return to Castle Wolfenstein v1.42d Patch' fom,.