Well I want to play a game called Dead frontier but my computer always messes up.

I have the latest version of, I think it was adobe reader. I just simply cant play it. I get in the game but my computer runs so slow and if I try to change areas on the game my computer messes up and it says there is a script in the game thats not working.

My computer was bought around year 2002 so its pretty old in computer years. So hence the question, is my computer too old?