Ok thanks, where do I get a discrete graphics card, do you know?
There's a couple hurdles to overcome before you purchase a discrete graphics card to be honest. You need to make sure the CPU (processor) in your computer is up to par first off. Assuming the processor is good enough to handle the game, you need to make sure your motherboard actually has the appropriate PCI-E 8x or PCI-E 16x slot in which to physically install the video card itself. You'll also need to make sure the system has enough RAM as well.
Beyond that, you need to make sure the PSU (power supply unit) inside the computer is strong enough to provide enough electricity (safely) to power the new graphics card as well. If you have a store bought computer (i.e. built by a company and sold in a box) you may or may not be able to actually fit a graphics card into the computer case itself.
Long story short, if you're not familiar with the technical aspects you may need some assistance in determining all these factors and then installing the graphics card.
Edit: Depending on the answers to all the questions raised... you could end up putting in a simple graphic card and being done... or having to replace your entire computer in order to play. There are several factors.
