Upgrades for EL1300G-01w ?????

[WARIO]

So basically I'm stuck with this crap of a computer (for now) but I like to play Free online games, like steam games.
So far the computer did pretty good but the games are getting bigger and better and this computer can't handle to newer ones.

My problem is I have no idea what I can upgrade on this desktop other then the 2gigs to 4 gigs (which I have not done yet) and I know that's not enough.

Here are the Specs----->>>> http://reviews.cnet.com/desktops/emachines-el1300g-01w/4507-3118_7-33667235.html

I have not upgraded or add anything to this computer all software is still default.

SO what are my options for upgrading on this computer

I wasn't sure where to post this question sense it has to do with everything in the computer.

[patio]

It would be a waste of money to put anything into that PC...

[Calum]

Seconded.  It's too old to be worth spending money on unfortunately.

[CP39]

Yep, definitely...get a new one!