If you are going to buy one... make sure your PC has a slot for it. A lot of especially budget PCs have the graphics built onto the motherboard, and annoyingly no upgrade slot for them.
If you don't have an AGP or a PCI Express slot, a normal PCI graphics card won't really be of much benefit to you, and would IMO be a bit of a waste of money.
AGP and PCI Express are both types of graphics card slot (technically PCI Express can be used for other things)
Normal PCI is generally too slow for any useful modern graphics processing.
If nothing else on your PC seems sluggish or broken, I would be tempted to leave it. It's usually games that require decent graphics, and from what I saw of that software, yeah it looks ok, but it would have to be worth the cost of the upgrade to you, if you know what I mean.