No audio from timeline

Ok, I'm using a copy of Premiere Pro 1.5 that has worked fine in the past. I went to start editing a new movie, and for some reason I wasn't getting audio when I played it in the timeline. I've discovered that:

-Video output for everything is working at all times, and audio works for all videos when played outside of Premiere

-No audio output whatsoever from timeline (tried music, tried all tracks, with output enabled on all)

-Some filetypes get audio in the Project window (.wmv, .mpg), and some don't (.avi, .mp3)

-I can export movie files that will have audio in a standalone player (even though I can't listen to them in any way in Premiere)-In Project > Project Settings > General... > Playback Settings, Audio Playback is set to Audio Hardware (the most common solution I found searching Google)


Wtf is going on? I recently formatted, although I can't remember if my last succesful usage of Premiere was before or after that. I also just uninstalled and reinstalled the whole thing.