Unable to create graoh for this device (1 Viewer)

[Kansberg]

TV-Server Version: 1.0RC2
MediaPortal Version: Newest
Windows Version: XP
CPU Type: AMD 4850e
HDD: WD GS 1TB
Memory: 4GB GeIL DDR2-6400
Motherboard: Gigabyte MA780 US2H
Video Card: Onboard ATI 3200
Video Card Driver: ATI
Sound Card: Onboard
Sound Card AC3: Realtek
Sound Card Driver:
1. TV Card: ASUS P7131 Hybrid
1. TV Card Type: Analog/DVB-T
1. TV Card Driver: Unknown
TV - HTPC Connection: Cable / HDMI

I've got a problem wanting to scan for channels..

When I go to the config part of mediaportal, and then to television, I try to setup my ASUS P7131 Hybrid,.. The DVB-T tuner is no problem, but it can´t find any channels.. However when I add my analogue tuner, it says "Unable to create graph for this device"...

What do I do??
I`m running on TinyXP..

Please help..