A External tv tuner to cpu for set top box

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Sorry i don't where this topic should go ... Please forgive me.

Thank you all in advance for giving me a good solution.

I have bought ZEB-L2012 but device put into trouble , like now power is not coming , i think it is the worst product in the earth and also before the power is up i tried connecting with the given cable but i am not getting my desktop and tv in worst quality. so 22 $ is waste . ok leave that , please help me in giving a good solution ,i mean good device which will help me in connecting 3 pin from set top box into cpu so that i can control TV using cpu , i mean inside the Operating system , like pinnacle tv tuner , BTW we actually have pinnacle TV tuner but that doesn't take 3 pin option or it doesn't have 3 pin port for taking set top box input ... Hope you all will give me the best solution .. Thanks in advance