Diamond Muiltimedia ATI theater 750 HD TV tuner card not working with Windows 8

Hi,

Thank you for posting the query in Microsoft community!

As you have already tried installing it in compatibility mode and still it does not work. I would suggest you to wait till the Diamond Multimedia ATI theater 750 release compatible drivers in order to work on Windows 8

For any further Windows related assistance, feel free to contact us and we will be happy to help.

At what point in time does Microsoft assume responsibility of keeping their software compatible with existing hardware. ATI hasn't made that wide a variety of TV tuner products. A $55 upgrade became a $155 upgrade when I decided to buy a TV tuner with a hardware MPEG2 encoder to solve this problem. The hardware vendors have to routinely fight to maintain support of their product in an existing software suite (media center) that keeps dropping compatibility for their products.

Hi Seattlehusker,

Thank you for sharing the information. This might help other users who are facing a similar kind of an issue.

I bought this Diamond TV Wonder HD750 PCI-e for my new Windows 8 Build and had few problems when I installed the Arcsoft TotalMedia software, all the software installed correctly except the hardware drivers themselves. After trying compatibility mode, I tried again running just the driver install App from the disc at:
"G:\Driver\Win7x64"

 bypassing the autoplay installation, but this did not work for me either. The programs would open but would display an error regarding missing TV Tuner Hardware. I was a bit disappointed when I couldn't find Win8 drivers at Diamond or ATI/AMD, but this prompted me to check just what the hardware issue was by looking in Device Manager.  The hardware was simply NOT getting its drivers from the installation applications.  What little info I found suggested some peeps were getting this to work by rolling back to the Win7 driver.  Since my new PC was a clean install because I upgraded from XP, I had no rollback drivers. Hmm, would a manual driver install work?
  I soon discovered the fix was fairly easy, all I had to do was a manual driver installation of the PCI-e device. Using Device Manager, I found the TV Wonder under the Sound, Video, and Game Controllers Heading. Note the TV Wonder is listed as "Hybrid ATSC/QAM PCI Express". Do NOT use the "find driver automatically", instead, I browsed to the installation disc to:
"G:\Driver\Win7x64\x64"
and selected the "av88pcie.inf" file.
  All ArcSoft Programs and TV Wonder features work great now.
  I wrote both Diamond and Microsoft because Microsoft compatibility site doesn't list the Diamond TV Wonder HD750 but does list the 650's. There is 1 AMD/ATI TV Wonder HD750 listed which I marked as compatible with possible manual driver install noting I'm using the Diamond version of the TV Wonder. Please, update drivers on site and pass this info along to help others who may have similar issues.  So far all ArcSoft software is working great since manual driver install. I will be testing with Win Media Center after I get it early April, and will share the results soon after.  Good luck and be patient, the fixes and updates will improve as more info is gathered, please share your experiences with Microsoft and the Hardware Manufacturers by whatever means possible, every bit of data & feedback received will help resolve most issues that come with the new OS.