Voices won't play in Necrovision
 

EDIT3: I redownloaded the setup file; apparently the old setup had a corrupted voiceovers file and config.ini. It works now.

EDIT2: Never mind, it works now. I killed the bad config.ini and the game generated a new one. Now, I have a different problem: the voices won't play, and the subtitles stay for half a second before disappearing.
I saw something in another topic about a Sounds/Voiceovers folder in data; those folders do not exist in my game directory.

My specs:

Windows 7 64-bit
Intel Core i5 (4 CPUs), 2.80 GhZ
6 GB RAM
ATI Radeon HD 5450 512 MB