Screw IE indeed.
So what HDD's do you have, any masters and or slaves? Rebooted after you hooked them up and booted your pc for the first time?
Did the sound just dissappear or have you done something to make the sound go away, cause if it suddenly stopped, thats not so good.
Strange that D3 now works after installing java and or flash and that it doesn't come whining about missing one or both programs = bad programming ^^ (if D3 requires one or both to play)