ATI HDTV Wonder hangs for 1080i stream format......

My system is:
OS: Windows XP SP2
DirectX: 9.0c
CPU: Pentium IV 2.26 GHz
Video Adapter: ATI radeon 8500 128MB ram

All the drivers for ATI HDTV wonders and Radeon 8500 are updated. ATI
decoder is also updated. It is working fine when I watch HDTV in 720i,
480i vedio stream format, but the system hangs when I try to watch the
HDTV with 1080i vedio stream format. Anyone knows how to solve this
problem ? Thanks.