Nice to see you poke your head up...long time no see! :-) I hope you're doing well.
At the very least, we need to know if you have an AGP slot or only PCI slots. And do NOT buy a card from Walmart...order it online from newegg or another site.
"If my answers frighten you then you should cease asking scary questions" - Jules Winnfield (Samuel L. Jackson) in Pulp Fiction