I think if you want to use this device for other PC , laptop or etc.. thus you should choose external tv card.
For connecting tuner to pc if you use external card , that is very easy to install tuner
1) connect tuner to usb port
2) install driver of device
3)install and adjust it's viewer
if you have internal card then you should turn off your computer and unplug of AC power.
1)install card on the PCI Slot on pc motherboard
2) hook up to power and turn on your pc
3) install driver and viewer software and tune Chanel for use.