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What happens when you use a straight HDMI cable, or does you card support HDMI natively? If it does, try that. If it doesn't, then I'll wager you have a problem with your "DVi to HDMI converter"--can you buy a DVI-to-HMI cable somewhere? That's your problem, no doubt.
Go here to grab a Microsoft utility that allows you to hide driver updates in Win10, to try your old driver.
Also, you must be disabling the audio driver incorrectly. Open the Device Manager, open Sound, video and game controller, and right-click on AMD HIgh Definition Audio Device and select Disable. Answer Yes to the verification question. That's it. It will not reenable upon a reboot. However, should you select Uninstall instead of Disable, the device will reinstall itself upon reboot.
Simpler solution, however, since you obviously don't wish to use your TV for sound is to simply turn the speaker volume on the TV all the way down or mute the sound from the TV using the TV controls. With the sound down all the way it doesn't matter if the GPU is outputting sound to it. It will not conflict with your preferred sound device.
Set overscan to 0%, then make sure your TV is set to 1:1 pixel mode (often called by other names). Or use VGA instead, which won't have the overscan problem, if the display supports it.