The best way to get drivers is to go to the Web site of the manufacturer, download them, and follow the instructions to set them up. Adjusting your video settings can help increase performance. For example, high resolutions have the ability to show more screen area, thus having more windows open and seeing more objects on screen in general. But, a larger resolution, on slower systems, can be a drag on overall performance, plus it reduces the number of colors your video card can display. The number of colors, similarly, can be a drawback.
More colors increase image quality, but can be a performance lag.
It also decreases available resolutions. Changing your video settings is pretty easy. Many name-brand video cards come with their own program to adjust the settings. You can use this. Besides this, if you're within a certain memory range, say 1 MB or Video RAM on a 64-bit video card, increasing the memory to 2 MB will help performance.