Right-click your Desktop, go onto Properties, go to the 'Settings' tab, click Advanced, then go on the nVidia or GeForce Tab, find some settings and find 'Image Quality', make sure the slider is all the way to the right.
Also, you should be fine, it's just your graphics card isn't exactly very good, but you should be able to play it, probably with all settings to minimum/lowest though. Try
www.nvidia.com and go on Downloads, then Drivers and find a driver in the Archive suitable for your card.
Although try re-installing first.