You can't. DVI does not do audio, the end. You will either need to go with an all HDMI setup or stick some kind of device, like a home theater receiver, between your computer and TV.
So unless you are willing to spend the time, energy, and money to learn home theater basics, and just using HDMI to your TV isn't an option, I'd just quit now. There is no magic solution out there. You either use a cable format that does video AND audio or you get some intermediary device which can reroute signals. Those are your choices.