I HAVE A VGN-AR21M WITH TVTUNER HYBRID (ANALOG AND DIGITAL) AND AFTER 3 YEARS OF USING IT, SUDDENLY I REALISED THAT THE MEDIA CENTER CAN'T SEE IT. I DID USED RECOVERY BUT IT STILL DOESN'T SEE IT. CAN YOU GIVE ME A HAND PLEASE?
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Hi SharkPanos and welcome.
Firstly check to see if your TV Tuner is installed correctly.
Go to Device Manager -> Sound, Video and Games Controllers and look for your AverMedia Tuner.
If it is there then try Media Centre Setup to re-set the device.
If it is not there you may need to reinstall the driver or the Tuner may have a fault. Are you still using XP or have you changed the Operasting System?
Thank you for your help. At Device manager I can see the AVERmadia hybrid H/W mpeg card, M115S.So When I am trying to set up the TV at Media Center, it gives me a message like "TV TUNER NOT FOUND". Do you know any other way to solve it? I will appreciate that. 
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