So the problem is in the topic title. I start the program, skip the intro, and then enter the menu. There I want to start a new game, but when it should go to loading, it exits to desktop and Windows tells me Dosbox has crashed. Now the funny thing is, a couple of months ago I played the game just fine, and since then, nothing has changed about my system.
I'm playing on Windows XP S3.

Also, I kept my Save folder, but the game doesn't see it, even if it's copied to its original place.

PS. It runs but the window is smaller. It crashes at loading when I would play it full-screen.

Have you tried changing the graphics mode for DOSBox? That's usually what causes issues if it does funny things when run in fullscreen.

I changed it, that's why I can run it now, but in a smaller window. I would really like it in full screen tho.