video card drivers r free. go to the chip manufacturer site and download the required .
if integrate as intel go to intel site. look for ur mother mother related downloads and there u r. if u dont know ur mootherboard name there is a small tool (type any mboard name in search section as this tool is common for all mboard) for download in their download section.
if nvidia geforce go to nvidia site.
if amd radeon go to amd site.
look for latest graphic diver in download section