Computer question. Adding a new video card into CPU.?

Hello guys. I have a very old VIZIO pc from back to the year 2002. I don't know much of the specs. One of my question is can I buy a newer VGA/HDMI video card for this old PC? Of course I got to make sure it fits, have the connection, ect. But I wanted to know if its possible or do I have to replace the... show more Hello guys. I have a very old VIZIO pc from back to the year 2002. I don't know much of the specs.

One of my question is can I buy a newer VGA/HDMI video card for this old PC? Of course I got to make sure it fits, have the connection, ect. But I wanted to know if its possible or do I have to replace the whole motherboard all together.

Thanks guys!
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