How will I fix the video adapter of a laptop?

How will I fix video adapter of a computer?
I am recovering my old Panasonic laptop that has Windows XP. At first it worked well. But after the installation of operating system. The VGA Adapter screen colors changed.
Then I uninstalled it and downloaded some drivers from internet and installed then everything was fine. It forced me to uninstall the driver also. The Windows XP runs on VGA adapter. Only problem is too slow and has a vertical colored lines to it. I also tried to removed some driver like the mouse and replaced it with usb mouse but nothing happen. How will I fix the video adapter of my laptop?
