Ati Tv Tuner Download
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TV Wonder™ PRO Drivers and ATI Multimedia Software for Windows XP Professional/Home Edition
http://ati.amd.com/support/drivers/xp/tvwonderpro-xp.html
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If you are running windows as your operating system (XP?) then windows media player is free.
You should also be able to get the drivers for your card from ATI for free. They have a trouble shooting page too.
http://support.ati.com/ics/support/default.asp?deptID=894
I am not familiar with MediaPortal, but they do have a forum on this type of problem.
http://forum.team-mediaportal.com/installation-configuration-support-53/xp-vista-known-issues-mediaportal-36529/
If I am reading some of it right you might have an ATI driver that is not supported and need an older version of the driver...
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OH, right, Mediacenter. sorry. You get that as part of Vista.
Well, I hope you get an answer that helps more than mine does.
Good luck. ATI's support for their tuner cards is poor at best. Try older releases of the software. You'll need their driver cleaner too. I through out two ATI HDwonders they never worked correctly. Get a DVICO Fusion5 or higher. They worked for me.