Hi wowser, I'm not technically savvy enough to help any more but I've included a link to a reputable site I've used before which will audit your PC:
http://www.belarc.com/free_download.html & should be able to give you some helpful info & tell you what updates you need
It sounds like you might have an integrated graphics card which is not so easy to upgrade enough to what you need now to play games - also you may need more memory although what you have is not bad for 5 years ago! It does seem, if you can afford it, worth investing in a new system which you can upgrade!
