simple technique to find out which card u have
go to desktop
right click on the my computer ICON-->Properties--->click at HARDWARE TAB------>DEVICE MANAGER---->At the table expand the
DISPLAY ADAPTER OPTION
there it would show you what CARD you have
one more way which is easy is
right click on desktop---->Properties---->Settings Tab----->under the monitor like icon you will have the name of you card
after getting the name and make of the card
go to
www.guru3d.com
and download the specific drivers
if you are confused dont worry
atleast find the name ,make of the card and post it here
and we will help you