Penumbra: Overture, forever looping danger music

[Straxedix]

"I have restarted the game, restarted Steam, restarted my computer, uninstalled and reinstalled the game, and even started the game from the beginning, but yet again, when I get to the generator part in the game, and I go to the fence, the music starts playing again and keeps looping forever."

Pretty much all he can do, but maybe he got illegal version that has a problems or something...