As I was playing Grand Theft Auto: San Andreas on my PC, a long white line suddenly appeared which replaced and started at a gang member's head and extended outwards. I think it might be because I have a poor video card (I have a Dell Dimension E520 which isn't rated very good for gaming so I think that might be the problem. It could also be that I'm using Windows Vista, but I don't think so because I have fixed the game so it works in Windows Vista.
I will be getting a video card that I believe meets the recommended requirements on my birthday, which is on June 24th.
Here is the snapshot I took of the glitch: