It could be that a driver update will solve your problems. Try going to www.nvidia.com and download the latest drivers for your graphics card.
However, I do agree with an upgrade. For 70$, I would recommend the Radeon HD5570. nVidia doesn't really have any budget current-gen parts yet, so I wouldn't recommend nVidia cards. The closest nVidia card I could find that will fit your budget is a GT220, and between that and a Radeon HD5570, the HD5570 wins.