After a seemingly normal installation, whenever I try to play it, the pop-up 'Do you want to allow this app to make changes to this device' for my Windows Command Processor app appears. If I press yes the cmd application keeps forcibly popping up and off for an unknown amount of times until it stops. I can't seem to figure out how to run the game.

same problem - Win 11, reinstall changed nothing
system32 command line pops up every second

edit: Message: Der Angegebene Wert bzw Registrierungsschlüssel wurde nicht gefunden. - found no registry key..

edit 2nd - game start after loading st.bat direct from the files. st.exe shows registry error
it starts with intro - fine, but not an easy solution

Tried it in my folders computer, after uninstalling and reinstalling the game.

Everytime I do run it now a small window pops up saying 'Error reading registry. Reinstall the game.' And this is after I had already uninstalled and reinstalled the game a few times before.

At this point, I wonder if its better to try and download it from an abandonware site, if I can find it.

Try https://www.gog.com/forum/submarine_titans/fix_for_registry_entry_not_found_reinstall_the_game_error