uhh... first you need to tell us what kind of parts you have, though we are sweet at what we do, we are not psychic.
if you got a video driver disk w/ your computer, put it in. basicly you need to reinstall everything
go to the page of your mobo manufacture, get updated bios drivers. go to the manufacture of your graphix chip set and do the same. for example i would go to MSI for bios updates/utilities then to nVidia for driver updates. I have avoided eVGA's utilities because i think alot of the feature's overlap nVidia's and I dont want conflicts. (eVGA made the card, nVidia made the chipset)
Usually if your video card is not being recognized, u probably need all your drivers for your motherboard installed still. simple windows updates will not do this, it has to do with backbone hardware recognition, not software updates.