Failed graphics card

Hello,

I have a Dell desktop with Windows XP that I've had for many years. I installed a GEForce graphics card many years ago

However I believe the graphics card has failed and is displaying a scrambled screen. Also the mouse locks up soon after bootup and sometimes the PC shuts down.

I would like to switch back to the integrated graphics card. What are the steps to do this ?

Do I need to physically remove the GEForce graphics card and connect the monitor to the default display port ?

Do I need to deinstall the GEForce drivers (or is that optional) ? 

thanks