You should be able to use a HDMI cable.
Most modern TV's don't have the old VGA cables but you may that if your current PC doesn't have a HDMI port then you may will want to buy a VGA to HDMI cable like these here, they only cost a few quid.
Amazon.co.uk: hdmi/vga cable
Just double check you are buying the correct male / female interface to fit you PC. Think you will need male VGA to fit you PC female VGA port.