broblem to watch tv (1 Viewer)

[mliu28]

TV-Server Version:
MediaPortal Version:
MediaPortal Skin:
Windows Version xp sp3:
CPU Type AMD Athlon(tm) 64 Processor 3500+:
HDD:
Memory 1 gb:
Motherboard: asus A8V-VM SE:
Video Card:
Video Card Driver:
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: terratec dvb-c:
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:
when i try to watch tv with mediaportal after about 10-15 min computers cpu usage jumps up to 100% and stays that way until i stop mp from task manager.
i have tried different codecs and versions of mp`s but nothing seems to work. any ideas?
thanks in advance!