Hi Gerard,
You can purchase an adpater to convert your VGA output into HDMI to be able to then plug into your TV. The other problem you will likely face is that since your PC is older there will be compatibility issues. VGA is an analog signal where HDMI is digital. You’re graphics card would need to be able to send Digital signal which is unlikely in an older computer. You can buy a converter but then you really need to consider if it’s worth the time and effort.