I think you should be ok.
But: your video graphics are shared with your main system RAM. Do you know how much of that you have? One way to find out is to right click on "my computer" and choose properties. It will tell you there the amt of RAM installed. You will need about 128 to get a decent view on the game given that some of it is given over to the graphics card.
What version of Direct X do you have? You may need to upgrade to version 8 - go to "start" "run" and type in dxdiag which will tell you. If you need version 8, go to MS update site and d/l it. Don't go for version 9 though.
Any more questions, feel free to ask.