Situation is:
I have the GOG version. Runs fine and smooth on it's own.
I install the UOP. No problems.
I start the game after UOP installation and it locks up and states that "Fallout 2 appears to run in compatibility mode" and nothing is to be done but shut it down.
I've tried changing the compatibily modes from the Fallout 2.exe properties, I've tried to reinstall both the game and the patch for numerous times, and it's the same message every time.
And the exact same thing happens with Killaps restoration project.
Any ideas from peeps who know about how to handle these things?