Sound but NO Video

Hi, I’m a new Kodi user. I have downloaded Kodi on my old Acer Laptop, but I’m only getting sound, but no video. I’ve googled this and tried numerous fixes with no joy. I go into the system settings, Video, making sure it’s in Expert mode, then into Acceleration. The Youtube videos I’ve watched all have ‘Decoding Method’ with Allow Hardware Acceleration (amcodec), (libstagefright) and (MediaCodec).

But I don’t even have ‘Decoding Method’ available on mine. I think the only video player I have on my laptop is Flash Player.

How can I get the Video working?

Thanks