WMV playback stops after few seconds (1 Viewer)

[wutzel]

MediaPortal Version: 1.2.2
MediaPortal Skin:
Windows Version: Win 7 64bit SP1
CPU Type: AMD X2 4200+EE
HDD: Hitachi 500GB
Memory: 2GB DDR2 Dualchannel
Motherboard: Gigabyte GA-61SME-S2L
Video Card: Gainward GTS450
Video Card Driver: 280.62
Sound Card: Realtek OnBoard
Sound Card AC3: Coax Out
Sound Card Driver:
1. TV Card:
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: ffdshow
MPEG2 Audio Codec: ffdshow
h.264 Video Codec: ffdshow
Satelite/CableTV Provider:
HTPC Case: Antec
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection: HDMI

Hello,
after reinstall Win7 (64bit) and MePo i have Problems with playback WMV Files (stops after few seconds). Codec is SAF 6.05.
On my old Win7 32bit works fine. Other Videos works.

Thanks for help and sorry for my english ;-)