$20 says he was looking at naughty web pages, so his parents took away the graphics card.
I remember when I was younger, my mother would take the mouse or keyboard, never both, ironically I only need one or the other to use a PC.
But in all seriousness, Tails, cut the power to your PC, open the case, take you card out, read what it says. I'm guessing you are downloading the wrong driver for the card. Also, make sure you're downloading the driver for your OS.
Also, install and run this program:
http://www.cpuid.com/pcwizard.php (Link top-left)
Go into the graphics/display section, see if it shows what it is installed as the graphics card.
(This program also will tell you EVERYTHING you could possibly want to know about you PC, aside from a few things, but those are irrelevant.