Mediaportal playing "scritchy" sound (1 Viewer)

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TV-Server Version: not use
MediaPortal Version: 1.0.0.0 rc1
MediaPortal Skin: bluetwo
Windows Version: XP SP3
CPU Type: AMD 3800+
HDD: Maxtor USB onetouch 4 500 Go / Samsung HD 300LD
Memory: 1 Go
Motherboard: Asus A8v-vm
Video Card: Nvidia 7200 GS
Video Card Driver: 6.14.11.6921 (nvidia)
Sound Card:
Sound Card AC3: soundmax (integrated)
Sound Card Driver: 5.10.1.4151 (analog device)
1. TV Card: none
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
h.264 Video Codec:
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:

Hi,

i have problem with media portal to play mp3/ogg/wma sound. All songs are very noisy, i tried winamp as external player without success. But the strangest thing is when i close MP i still have the winamp player with the last song and when i press play, the sound is good... Noises are gone.

Is anybody know why ?

Regards

Etienne