You should have a icon down on your user taskbar (usually lower left hand corner but it can be elesewhere)
If this is a graphic chip on the mother board and not a actuall card I am not sure where you will find it but I would look in the NVIDIA folder for starters.
But with those specs I would not expect a whole lot of improvement. I would suggest that you invest in a new system espically if you have plans on buying FS X.
You can go with a store bought system or build your own. It is usually cheaper to build your own system un less you want all of the other software that can come on store bought system
Try
www.tigerdirect.com This is a great place to buy everything you need check out the bare bones systems that they have you can find everything you need here.
A barebones system can come with every thing you need with the exception of a opertaing system. That is a case; motherboard; power supply; cpu and some even come with ram.
