I'd say you got something wrong.. music works for me.. actually I think my midi problems were a walkthru I had open.. (but the annoying bit is turn the music down everytime can't hear voices..)

All I can say is it crashes maybe once a hour.. worst there is to say..

I've been playing it.. I've made it to Act III..

The only things I note on my vista x64 box is sometimes the midi go crazy (I had to reboot to get my sound back) and sometimes it's crashes once in a while.. (so just save often)