Having problems with BioShock on PC

[6750aae8205bdThe Punisher]

I'm having a big problem with BioShock on PC.
When I attempt to go to Fort Frolic it either restarts the computer or just quits the game.
I have completed the game once and it didn't have this problem before as far as I can remember.

Edit.
The other levels load as usual, but why isn't Fort Frolic working?