Mp very slow (1 Viewer)

[pettew]

My MP is very very slow . It takes up too 20 sec too change tv channel , and it takes about 30sec too start my tv .
I´ve have ok signal with antenna .

TV-Server Version:
MediaPortal Version:
MediaPortal Skin: Xface
Windows Version: Vista
CPU Type: Intel Core*2 1800 4,3
HDD: Hitachi 320ggb
Memory: ddr2 2gig
Motherboard:
Motherboard Chipset: Intel
Motherboard Bios:
Video Card: ATI 1650 256mb
Video Card Driver: 840100 071022
Sound Card: on board
Sound Card AC3:
Sound Card Driver:
1. TV Card: Firewire
1. TV Card Type: DVB-T
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: ATi
MPEG2 Audio Codec: Mpa
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote: Mce
TV:
TV - HTPC Connection: Hdmi