windows 7 sound problem.

I have a problem with my audio in Windows 7 64bit. I just switched from XP to Windows 7, I installed the latest driver for my ALC883 on board audio card (P5K). Now when I play a song on my 4.0 boxes I have weird sound coming from the rear speakers, like you can only hear the beats and no voice.

If I play this same song (also with windows media player) on xp this went perfect, you can hear the (full)song as well in the front or at the back speakers...

Does anyone have an idea what I can do to fix this?
(speaker fill settings is also turned on, otherwise I don't get sound from the rear speakers)
thx, Fre

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