digging...
http://www.tomshardware.com/forum/246848-33-catalyst-media-center hmm.. so is your tv tuner from ati or an AIB like sapphire?
an older rage3d thread also noticed that CMC is a modded cyberlink app, they cant just leave it available for dload as there's licensed code/etc (just saw another thread, apparently there's a payware mpeg decoder inside)
you might end up having to prove to ati (or whoever packaged your card) that it's yours & they should give it to you
here are apparent alternatives as of april 2008
"SageTV (Pay)
GBPVR (Free)
MediaPortal (Free)
Meedio (Free)
Myth TV (Free Linux)
IMO ATi Media Center is a piece of junk anyways."
PM coming your way..