Good Decoders for Sat HDTV

[m79]

Hello all, ive been reading alot of posts around here and wanted to ask one thing.
I have satellite on my computer and am using the program AltDVB, but when i am watching HDTV it seems to lag, like its sort of a bit choppy when the camera is moving fast, and my cpu usage is around 20-60%
My computer is an ...
AMD athlon 3500+
ATI 256mb x800GT
2 GB of ram
250GB SATA HDD
and a twinhan 102g satellite card
and for what its worth these channels are from bev

and i have tried using nvidia, cyberlink and intervideo codecs, i was just wondering if my computer is fast enough to handle smooth HD, and is there any other codecs i should try? I have high signal on my Satellite channels so that is not the problem.

or
is there a way i can remove this "lag" later on when i am encoding my videos.
Thanks alot to anyone who can help

[fenomeno83]

use coreavc(for h264 channels as luxe hd) and set skip all deblocking and directshow deinterlacing and in your sat player(the best is dvbviewer)set overlay mixer.for mpeg2 channels I prefer nvidia purevideo

[m79]

Im guessing bell HD channels are mpeg2 (right?).
and i just realized one thing, when i record the video (to a .ts file)
and watch it using MPC it does not lag like when i am watching it live,
I am using Nvidia codecs for sound and video.
Any other suggestions, and i could not get "DVBViewer" to work with my card.
http://i26.photobucket.com/albums/c139/aleks7868/Codecs.gif
are those the right ones, and is there any other sound/video codecs i could try
Thanks alot