If your Computer has an HDMI port and your TV has an HDMI port then an HDMI cable is your best bet. Check package for length to make sure you have enough to run between PC and TV.
If you are missing the HDMI port on either TV or PC then you have a more complicated problem and I would recommend asking the Geek Squad for help. Have model numbers on TV and PC ready. May require adapters. Also, Be aware there may be a hot key on PC to activate the signal to TV once you have it connected. Often you can connect the cable to both TV and PC then power on the PC and it will recognize the connection.