When installing new viedo card on mob with built in graphics, am I correct that when new card is slotted it automaticaly disables on board drivers? Thanks butchp123

It should. Also the bios should give you the option of on-board video, PCI video, or auto (or similar choices), so set it properly.

Windows may give you a blank screen on bootup though, if you don't uninstall the on-board video drivers first.