Choose a new video card that is compatible with your computer system.
Uninstall the existing video card drivers. Right-click "My Computer," select "Properties," click "Hardware" and click "Device Manager." In the Display Adapter section, double-click your existing video card. In the Properties menu that appears, select the Driver tab and press the "Uninstall" button.
Remove your existing video card. To prevent any shocks, wear an antistatic wrist strap. Turn off your PC and disconnect the power supply. Open the CPU case and locate the AGP slot of your motherboard (above the white PCI slots). Unscrew the video card from the back plate and take it out.
Insert the new video card firmly and completely. Screw it to the back plate.
Install the new drivers. Windows XP will guide you through the installation process. For other operating systems, open the Control Panel through the Start Menu. Click the "Add/Remove Hardware" option to activate the installation wizard.