To update your video and sound card drivers.
If you don't know where to look, Everest Home Edition will help:
This little tool not only will identify the hardware but will also point you to the driver update websites.
I'm rebuilding an old computer to give away. I can't get any higher resolution than 640X480 which makes any graphic looks fuzzy. Also I cannot get the sound to work. I transferred the hard from another computer.
The monitor is a Compaq Presario MV500 working on a standard PCI graphics adapter. The max # of colors is 16.