That video card is fine for older games.
If you have that little left of memory and it is running slow, I think you need to look at cleaning up the crap installed on the computer instead of getting better hardware to cover it up.
If you want to get anything for that computer, I would just get 1GB of ram:
http://www.newegg.com/Product/Produc...82E16820161627
But even if you get that ram, look to clean up some of the junk off of your computer if it uses that much ram already.