Tv Server and Mediaportal Problem: UnableToStartGraph (1 Viewer)

[Arnezami]

MediaPortal Version: 1.0.2.0
MediaPortal Skin: Blue
Windows Version: Windows XP SP3 (Last Update) + .net Framework 3.5
CPU Type: AMD Athlon X2 240
HDD: Hitachi 1.5 TB
Memory: 2 GB
Motherboard: Biostar
Video Card: HD 4200
Video Card Driver:
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: TechniSat SkyStar HD2
1. TV Card Type: DVB
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:

After configuring the media portal, I faced a problem: After I scanned the satellite for channels, I try to start previews and I wrote a bug: previews falied: UnableToStartGraph. Help solve the problem!